gluster:Support Striped_replicate volume types

Add STRIPED_REPLICATE and DISTRIBUTED_STRIPED_REPLICATE
as an enum value in GlusterVolumeType
Added code to handle these while getting
* list of volume types
* syncing volume types
* creation of volume

Change-Id: I517c1e9e41f1bb68626d5a8a45d679208934d98f
Bug-Url: https://bugzilla.redhat.com/970759
Signed-off-by: Sahina Bose <sabose@redhat.com>