gluster: set glusterfs dependency version

Now vdsm-gluster depends on glusterfs version 3.4.0 or higher.

Change-Id: Icb42bf4dec26b118f52cc51701faa5e611f63c00
Signed-off-by: Bala.FA <barumuga@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/12960
Reviewed-by: Aravinda VK <avishwan@redhat.com>
Tested-by: Aravinda VK <avishwan@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>