Fixed issues in Cruise Control

Review the list of Cruise Control issues that are resolved in Cloudera Runtime 7.2.18.

CDPD-47616: Unable to initiate rebalance, number of valid windows (NumValidWindows) is zero
This issue has been fixed as the Cloudera Manager Metrics Reporter is deprecated from Cruise Control.
OPSAPS-68148: Cruise Control rack aware goal upgrade handler
As Cruise Control automatically overrides all occurrences of the deprecated RackAwareGoal with RackAwareDistributionGoal during upgrade, the customized values of the Cruise Control goals will remain the same and there is no need to manually provide the values after an upgrade.