Call ironic-dbsync with proper --config-file option

Without --config-file option ironic-dbsync creates SQLite database
in the current directory, instead of migrating MySQL database.

Change-Id: Ib733dbf9198a037114f6221e974acb29d109ff22
Save OPENSTACK_KEYSTONE_URL to horizon local_settings

OPENSTACK_KEYSTONE_URL is not saved to local_settings correctly,
this patch fixes this bug.

Change-Id: I4275f035be3d8ab013840d8b5e3f9a5e292a366b
Remove obsolete sahara keystone auth conf

Change-Id: I9005d99540572bd1e9251683b1e9cc6638afa7e7
Merge "Save OPENSTACK_KEYSTONE_URL to horizon local_settings"
Merge "Remove obsolete sahara keystone auth conf"
Merge "Call ironic-dbsync with proper --config-file option"
Merge branch 'master' of https://github.com/openstack-dev/devstack