Issue
-----
In case the state of an innodb monitor(enabled/disabled) is
changed during a test, it can affect other tests running after
it and lead to failures.

Fix
---
- Ensure that tests leave behind InnoDB monitors in their initial
  state (i.e., before the test run starts) by including the below
  entry in MTR check of test cases.
  SELECT name, status FROM INFORMATION_SCHEMA.INNODB_METRICS
  ORDER BY name;
- The patch also restores InnoDB metrics to their original state
  at the end of tests which modify them.

Change-Id: I116b7c3559ed2786fc24fed47305226d0a9e157c
RB: 23311