When an error occurs in Trove, it is very difficult
to determine the cause without access to the
server logs. To make these errors available to
the end user, they are now persisted in the database
and can be viewed using the standard 'show' command.
Also fixed TESTS_USE_INSTANCE_ID test path, as it
somehow got broken over time.
Change-Id: I84ed28ee73a24a2dd6bdbf895662d26e406e9fae
Depends-On: I5d3339e9cbfd6aeb0c3ff6936fefa8dbe9e841f8
Implements: blueprint persist-error-message
2a9fa44364