Change sahara-api to sahara-all

Right now sahara-all is just an alias to sahara-api. After
https://review.openstack.org/#/c/90350/
is merged, sahara-all will be the only right binary to run Sahara in
all-in-one mode. So we need to adjust the CI before we merge the fix
above.

Change-Id: Ibc67fd031e6a539af3d16873c3e88b229c1c65f6