create datalake plugin

[drummerwolli]

fix #351

the DL has an API. You submit a query, then wait for it to finish, and then retrieve the results. I modeled now the most basic plugin I could think of which is executing this flow.

Comments/feedback on this highly appreciated!

disclaimer:

• never did something in python2
• can't test locally due to broken setup
• have not tried it with the actual data lake (don't know how)

[drummerwolli]

#394 needs to get merged first ...

[codecov]

Codecov Report

Merging #393 into master will decrease coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #393      +/-   ##
==========================================
- Coverage   75.73%   75.54%   -0.19%     
==========================================
  Files          80       80              
  Lines        5918     5918              
==========================================
- Hits         4482     4471      -11     
- Misses       1436     1447      +11

Impacted Files	Coverage Δ
zmon_worker_monitor/workflow.py	68.7% <0%> (-3.96%)	⬇️

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[mohabusama]

Thanks!
Since this is a very specific plugin (not very useful in non-OSS context), I suggest moving it to zmon-extras plugins.