Reduce the logs written by default during reconciliation

[leochr]

Reduce the logs written by default during reconciliation.

By default, print only the errors. Stack traces should be printed only for debug mode.

Introduce log level(s) for additional logging statements (i.e. Debug or Fine/Finer/Finest). Log level could be set as an env variable in Subscription (or in Operator's ConfigMap).

[leochr]

FYI @kabicin

[idlewis]

In the sample log file, there were lots of
INFO utils Reconciled {"Kind":....
messages. These should def. be debug messages. This is an easy fix and is already addressed by the above PR

There also seems to be one of these messages per loop:
NFO controller.WebSphereLibertyApplication Start Semeru Compiler....
which also feels like it should be debug. This is a WLO fix, so will need to wait until the RCO fix has been merged.

We are also logging most stack traces twice. Eg. in
internal/controller/webspherelibertyapplication_controller.go
we do:

                        if err != nil {
                                reqLogger.Error(err, "Failed to reconcile Route")
                                return r.ManageError(err, common.StatusConditionTypeReconciled, instance)
                        }

The call to reqLogger.Error(err,... logs the stack trace, but the call to r.ManageError(... also logs the stack trace.
I'm not sure how easy it will be turn off stack traces from calls to log.Error(..., but it would be easy to turn off the double logging by making the messages from r.ManageError(... into debug or info messages.
@leochr what do you think?