Stop pointing to the installer script. Update download links.
Added more logging in HA

Removed a flaky test which is not applicable after we've introduced UpdatePuller
Added logging to help locate where all instances in a cluster see others as available.
Merge pull request #3598 from S124568/2.2-cluster-topology-IT-flakiness

Added more logging in HA
Merge pull request #3609 from nawroth/installer

Stop pointing to the installer script. Update download links.