Don't fail if the application_name is not set properly

If you set application_name to a wrong value, pgsqlms returns a "OCF_ERR_CONFIGURED" that will trigger fencing of the nodes where the service are started. It should return "OCF_ERR_ARGS" instead.

pgsqlms should return a lower level error.

Start by locating pgsqlms handling for an invalid application_name and the mapping of its OCF error codes. Reproduce the wrong-value case, then verify that it returns OCF_ERR_ARGS rather than OCF_ERR_CONFIGURED, so the error does not trigger node fencing.

Written by the indexing model from the issue text.