Review from pyr https://reviews.apache.org/r/20557/
CLOUDSTACK-6472 listUsageRecords: Pull information from removed items as well, fixing NPEs/Null UUIDs with usage API calls.
CLOUDSTACK-6577: Disable service monitoring in RVR
CLOUDSTACK-6578: Fixed issue in delete remote access vpn command
CLOUDSTACK-6531: stopping the router in case of command failures. Also added alerts for failures.

Signed-off-by: Jayapal <jayapal@apache.org>