fix k8s plugin discovery to allow multiple addrs on an endpoint

[edaniszewski]

this also adds tests and bumps the version

fixes #216

[codecov]

Codecov Report

Merging #217 into master will increase coverage by 4.27%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #217      +/-   ##
==========================================
+ Coverage   83.28%   87.55%   +4.27%     
==========================================
  Files          46       46              
  Lines        1358     1358              
==========================================
+ Hits         1131     1189      +58     
+ Misses        227      169      -58

Impacted Files	Coverage Δ
synse/__init__.py	100% <100%> (ø)	⬆️
synse/discovery/kubernetes.py	100% <100%> (+83.33%)	⬆️
synse/plugin.py	87.91% <0%> (+2.01%)	⬆️

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