fix(userspace/libsinsp): disable HTTP proxy for CRI connection

[wigol]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

Any specific area of the project related to this PR?

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/area API-version

/area build

/area CI

/area driver-kmod

/area driver-bpf

/area driver-modern-bpf

/area libscap-engine-bpf

/area libscap-engine-gvisor

/area libscap-engine-kmod

/area libscap-engine-modern-bpf

/area libscap-engine-nodriver

/area libscap-engine-noop

/area libscap-engine-source-plugin

/area libscap-engine-savefile

/area libscap

/area libpman

/area libsinsp

/area tests

/area proposals

Does this PR require a change in the driver versions?

/version driver-API-version-major

/version driver-API-version-minor

/version driver-API-version-patch

/version driver-SCHEMA-version-major

/version driver-SCHEMA-version-minor

/version driver-SCHEMA-version-patch

What this PR does / why we need it:
This change explicitly configures GRPC channel used for CRI socket communication to skip HTTP proxy configuration.
Since the CRI path already hardcodes unix://, the proxy will not be used anyway, but by disabling it we are silencing the unnecessary error message.
See https://github.com/grpc/grpc/blob/2de2e8dd8921e1f7d043e01faf7fe8a291fbb072/src/core/ext/filters/client_channel/http_proxy.cc#L111 and https://github.com/grpc/grpc/blob/2de2e8dd8921e1f7d043e01faf7fe8a291fbb072/src/core/ext/filters/client_channel/http_proxy.cc#L122-L125 .

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[github-actions]

Perf diff from master - unit tests

     5.35%     -1.67%  [.] next
     0.88%     +0.87%  [.] libsinsp::sinsp_suppress::process_event
    10.32%     -0.86%  [.] sinsp_parser::reset
     4.35%     -0.84%  [.] sinsp_evt::load_params
     0.49%     +0.62%  [.] sinsp_split[abi:cxx11]
     1.48%     -0.60%  [.] sinsp_parser::parse_context_switch
     2.76%     +0.59%  [.] sinsp_thread_manager::get_thread_ref
     1.98%     +0.52%  [.] scap_event_decode_params
     1.32%     -0.45%  [.] sinsp_parser::event_cleanup
     1.41%     -0.43%  [.] sinsp_threadinfo::~sinsp_threadinfo

Heap diff from master - unit tests

peak heap memory consumption: 0B
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B

Heap diff from master - scap file

peak heap memory consumption: 0B
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B

Benchmarks diff from master

Comparing gbench_data.json to /root/actions-runner/_work/libs/libs/build/gbench_data.json
Benchmark                                                         Time             CPU      Time Old      Time New       CPU Old       CPU New
----------------------------------------------------------------------------------------------------------------------------------------------
BM_sinsp_split_mean                                            -0.0159         -0.0159           154           152           154           152
BM_sinsp_split_median                                          -0.0173         -0.0174           154           152           154           152
BM_sinsp_split_stddev                                          -0.2661         -0.2666             2             1             2             1
BM_sinsp_split_cv                                              -0.2542         -0.2547             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_mean                  +0.0121         +0.0121            60            61            60            61
BM_sinsp_concatenate_paths_relative_path_median                +0.0114         +0.0114            60            61            60            61
BM_sinsp_concatenate_paths_relative_path_stddev                +0.7079         +0.7087             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_cv                    +0.6875         +0.6884             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_mean                     -0.0235         -0.0235            25            24            25            24
BM_sinsp_concatenate_paths_empty_path_median                   -0.0286         -0.0286            25            24            25            24
BM_sinsp_concatenate_paths_empty_path_stddev                   +3.9941         +4.0008             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_cv                       +4.1141         +4.1210             0             0             0             0
BM_sinsp_concatenate_paths_absolute_path_mean                  +0.0056         +0.0056            63            63            63            63
BM_sinsp_concatenate_paths_absolute_path_median                +0.0048         +0.0048            62            63            62            63
BM_sinsp_concatenate_paths_absolute_path_stddev                +0.9916         +0.9908             0             0             0             0
BM_sinsp_concatenate_paths_absolute_path_cv                    +0.9806         +0.9798             0             0             0             0
BM_sinsp_split_container_image_mean                            +0.0193         +0.0193           391           398           391           398
BM_sinsp_split_container_image_median                          +0.0195         +0.0195           391           398           391           398
BM_sinsp_split_container_image_stddev                          +0.2563         +0.2558             2             2             2             2
BM_sinsp_split_container_image_cv                              +0.2325         +0.2319             0             0             0             0

[Andreagit97]

/approve

[poiana]

LGTM label has been added.

Git tree hash: 4c895fcb8306238c373d3bebb1b9def1c1ce3151

[FedeDP]

/approve

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Andreagit97, FedeDP, wigol

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.69%. Comparing base (c49225d) to head (0f6c997).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2113   +/-   ##
=======================================
  Coverage   73.69%   73.69%           
=======================================
  Files         253      253           
  Lines       31914    31916    +2     
  Branches     5613     5631   +18     
=======================================
+ Hits        23519    23521    +2     
- Misses       8371     8375    +4     
+ Partials       24       20    -4     

Flag	Coverage Δ
libsinsp	73.69% <100.00%> (+<0.01%)	⬆️

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