Fix/registry logging

[andre-merzky]

This makes ZMQ logging more sane to handle.

[codecov]

Codecov Report

Attention: Patch coverage is 79.51807% with 17 lines in your changes missing coverage. Please review.

Project coverage is 62.18%. Comparing base (140d527) to head (b7f3e14).
Report is 13 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/radical/utils/zmq/queue.py	80.76%	5 Missing ⚠️
src/radical/utils/zmq/registry.py	76.47%	4 Missing ⚠️
src/radical/utils/zmq/utils.py	33.33%	4 Missing ⚠️
src/radical/utils/zmq/pubsub.py	89.47%	2 Missing ⚠️
.../plugins/unittests_1/plugin_unittests_default_1.py	0.00%	1 Missing ⚠️
.../plugins/unittests_2/plugin_unittests_default_1.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #414      +/-   ##
==========================================
+ Coverage   61.95%   62.18%   +0.22%     
==========================================
  Files          62       62              
  Lines        6845     6899      +54     
==========================================
+ Hits         4241     4290      +49     
- Misses       2604     2609       +5     

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[mtitov]

I got confused with the necessity of introducing this.. I see that you've updated ns for loggers (some of them were already set correctly), which makes it easy and right way to control all of this with RADICAL_UTILS_ZMQ_LOG_LVL.
As well:

• all debug messages here are level 9, thus they will never appear for the regular debugging and controlling their appearance with the env variable above is straightforward;
• with the proposed setup it is not possible to turn off zmq-related log messages completely;

[mtitov]

one more thing, we can keep an explicit default value for RADICAL_UTILS_ZMQ_LOG_LVL in DefaultConfig (utils_default.json)

[andre-merzky]

Not really a necessity, but convenience: the ns is not consistently used, specifically when some ZMQ subscriber etc uses a 3rd party logger (such as the agent logger etc). Also, the bulk_log method is a bit expensive even when not logging anything, so I wanted to shield zmq logging separately.

[mtitov]

LGTM!