Add create and update times for trove components

Currently trove doesn't show created and updated
timestamps on databases and backups - this is
inconsistent with other dashboard components such
as compute and images

Add created and updated timestamps to details
page of databases and backups.
Backups was already display a 'Created At'
timestamp so also made the wording and formatting
of this consistent

Change-Id: Ia6011db3693471602328e6d471ca2064e882354d
Closes-Bug: #1336865
Merge "Add create and update times for trove components"