packaging: setup: clean '&' in jdbcTlsOptions

Without this change, we might get an '&' immediately after the '?' in
ENGINE_DB_URL.

Related-To: https://bugzilla.redhat.com/show_bug.cgi?id=1002401
Change-Id: If8bb485e03c9d9d4c967f763a157151b11cbb84d
Signed-off-by: Yedidyah Bar David <didi@redhat.com>