Fix Sahara support
Fix Sahara support

After https://review.openstack.org/192721 was merged, some small
adjustments are needed to enable Sahara support in Packstack. If
not, only openstack-common will be installed and the service will
be configured, but no services will be started.

This commit adds sahara-api and sahara-engine, so Sahara will use
the suggested split mode.

Fixes: rhbz#1265661

Change-Id: Ib403b5bcf08c5ac71f073992cffbe3c634818c61

openstack/packstack,stackforge/packstack,mahak/packstack,imcsk8/packstack,fr34k8/packstack,mahak/packstack,openstack/packstack,fr34k8/packstack,imcsk8/packstack,stackforge/packstack,fr34k8/packstack,xbezdick/packstack,mahak/packstack,xbezdick/packstack,xbezdick/packstack,imcsk8/packstack,stackforge/packstack,openstack/packstack