LP#1366964 Update libdbi connection test error parsing

Modern version of libdbi return a slightly different error message for
queries which fail mid-transaction, causing an C-based DB backends to
exit abruptly unnecessarily.  Update the error message test to include
the new format.

Includes Perl live test for confirming functionality.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Jason Stephenson <jstephenson@mvlc.org>