engine: Disable Gluster Swift services feature

Disabling the Gluster services management feature
as the services are currently managed per server
and this is not needed for managing Gluster for
Swift services
This feature is going to change in the next release
and so disabling to avoid confusion

Change-Id: Icc5b5795a13b3d3c1e9b574c445e63a844669d5b
Bug-Url: https://bugzilla.redhat.com/1006708
Signed-off-by: Sahina Bose <sabose@redhat.com>