Fixes in Overseer

Bug fixed

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Issue [if exist]

resolves: #23 (closed) and #24 (closed)

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How it was fixed?

Changed category of ErrorInResponse rule and forced to be processed as default (last).

Rewritten should_sleep, to properly decide when it is needed

Also moved tests for overseer from wax to beeekeepy

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Standard Checks

• I created proper MR in following repos:
  • test-tools: test-tools!283 (merged)
  • hive: hive!1640 (merged)
  • wax: wax!380 (merged)
  • clive: clive!758 (merged)

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