Monitor needs to be reset after the view change

As of now, monitor is reset when view change starts, so there can be more ViewChanges because of degradation, as ViewChange may take up to 5 mins, and degradation may be detected for 4 mins.

Acceptance criteria:

• Add tests that no degradation can be detected during the view change
• Reset monitor when view change ends (add unit tests for this)
• Do not send InstanceChange because of degradation during view change (add unit tests for this)