Add endTime support for Scalyr Wrapper

[vetinari]

this parameter specifies the number of minutes before now the end of the search time. When this is not given, the old behaviour of 24 hours (scalyr default) applies. Example to search for logs from 3 days ago to now is then scalyr().logs(minutes=3*24*60, until=0)

fixes #349

[codecov[bot]]

Codecov Report

Merging #352 into master will increase coverage by 0.85%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #352      +/-   ##
==========================================
+ Coverage   75.18%   76.03%   +0.85%     
==========================================
  Files          79       79              
  Lines        5750     6171     +421     
==========================================
+ Hits         4323     4692     +369     
- Misses       1427     1479      +52

Impacted Files	Coverage Δ
zmon_worker_monitor/builtins/plugins/scalyr.py	96.84% <100%> (+0.37%)	:arrow_up:
zmon_worker_monitor/process_controller.py	84.86% <0%> (-0.53%)	:arrow_down:
zmon_worker_monitor/zmon_worker/tasks/main.py	78.85% <0%> (+4.15%)	:arrow_up:

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[vetinari]

:+1:

[mohabusama]

Why don't we set the default end=0? since this is the expectation anyway.

[mohabusama]

👍

[vetinari]

:+1: