Remove JDK9 from travis configuration
Remove JDK9 from travis configuration

Signed-off-by: Alexandre NICOLAIE <c7dadae7404a9d85e79a3cd4812885f4b10ab0b3@Kratos-ISI.com>

kairosdb/kairosdb,ppbizapps/kairosdb,ppbizapps/kairosdb,ppbizapps/kairosdb,kairosdb/kairosdb,ppbizapps/kairosdb,kairosdb/kairosdb,ppbizapps/kairosdb,kairosdb/kairosdb,kairosdb/kairosdb,kairosdb/kairosdb