zmq startup is faster than we think

[andre-merzky]

This shaves a couple of seconds from session and component startup in RP.

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.

Project coverage is 61.56%. Comparing base (e0e8158) to head (782352e).
Report is 2 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/radical/utils/zmq/queue.py	33.33%	2 Missing ⚠️
src/radical/utils/zmq/pubsub.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #429      +/-   ##
==========================================
- Coverage   61.57%   61.56%   -0.02%     
==========================================
  Files          62       62              
  Lines        6980     6980              
==========================================
- Hits         4298     4297       -1     
- Misses       2682     2683       +1     

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[AymenFJA]

LGTM, thanks Andre.