CMS - simplify gridpack search in lhe_generators.py

[katilp]

The lhe_generators.py script takes the gridpack location from the "fragment". It queries the fragment first through URL and then from the mcm-store. The URL query is not necessary.

Furthermore, all gridpack paths start with /cvmfs/cms.cern.ch/phys_generator/gridpacks so it can be used as the query string.

For the record, verified with the full mcm-store taking chains the LHE step:

Fragments that include string /cvmfs/cms.cern.ch/phys_generator/gridpacks

chains=$(ls inputs/mcm-store/chain)
for c in $chains; do f=inputs/mcm-store/chain/$c/*LHE*/dict/*json; [ -f $f ] && jq . inputs/mcm-store/chain/$c/*LHE*/dict/*json | grep '"fragment":' | grep /cvmfs/cms.cern.ch/phys_generator/gridpacks; done | wc -l

-> 20046

all LHE steps

for c in $chains; do f=inputs/mcm-store/chain/$c/*LHE*/dict/*json; [ -f $f ] && jq . inputs/mcm-store/chain/$c/*LHE*/dict/*json | grep '"fragment":'; done | wc -l

-> 20222

The difference makes 176 which is the number of LHE cases with mcdb_id (#235 )

[katilp]

Closing through 5a6eb86