We had a case where the authorization VIP was reset after the
monasca-api started. The auth connection pool did not try to
reconnect since we did not meet the configured idle time, and
we had to restart the monasca-api. This fix will allow the
monasca-api to reconnect the auth pool connections when we
get an exception.
Change-Id: I7e45970360720193b2d0ba27964bc22f66db79d3