[ADMIN_API]: More AF dual LB fixes and errmsg

Several modifications to get the DB status right for failed devices
that failover having both an HTTP and TCP load balancer attached.
Also changed statusDescription to errmsg on the database side.

Change-Id: Icf7fd03434119a668c421fa3a9dc1b3e49808070
Merge "[ADMIN_API]: More AF dual LB fixes and errmsg"