In the current implementation, if for any reason a duplicate
service entry gets created, the call to update that service
will fail endlessly, and instead cause the service to create
new entries everytime update_service_status gets called. Causing
it to fill the database with duplicate entries.
This patch adds a unique constraint to the service_statuses
table based on the service_name and hostname, to ensure that
this cannot happen.
In addition we add a new test to the storage driver and further
expanded the central service test coverage.
Change-Id: I307a8f7dd8b8a83effa447a846db3288efa32dba
Closes-Bug: #1768824
1924abff40