Fail with an error on /ping immediately if DB is not accessible
Fail with an error on /ping immediately if DB is not accessible

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1553223

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic