webadmin: When adding new domain disable V1 format in Posix & Gluster

When adding a new domain without a storage pool, there was an option to add
a Posix & Gluster domain in format V1, this makes no sense since Posix and
Gluster both are not supported on V3.0 which is the only version that
supports V1 format for data domains

Bug-Url: https://bugzilla.redhat.com/955641
Signed-off-by: Tal Nisan <tnisan@redhat.com>
Change-Id: I4c53773f9d034bcee71e033df56adafbb516e474