packaging: setup: Fix issue while installing Gluster only mode

When application mode is selected as Gluster, engine-setup was
failing with error "Failed to execute stage 'Misc configuration': 'NFS'"

Change-Id: I25656cff4f25a47199905dd4f4b2e683f1066c00
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1002854
Signed-off-by: Aravinda VK <avishwan@redhat.com>