zmq fixes

[vegu]

fixes #126: zermoq plugin config validation wants both bind and connect to be set
fixes #128: module 'zmq.asyncio' has no attribute 'PUB'

[codecov]

Codecov Report

Merging #129 (cbfd050) into master (10b6cec) will increase coverage by 0.02%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #129      +/-   ##
==========================================
+ Coverage   69.81%   69.84%   +0.02%     
==========================================
  Files          17       17              
  Lines        1110     1111       +1     
==========================================
+ Hits          775      776       +1     
  Misses        335      335              

Impacted Files	Coverage Δ
src/vaping/plugins/zeromq.py	68.88% <66.66%> (+0.70%)	⬆️

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