webadmin: Hide virt specific fields in gluster only mode

Hiding following Virt related  fields in gluster only mode.
1. Select as SPM action under host
2. Network Provider option in New Host Popup
3. Network Provider tab in Install Host Popup
4. Emulated machine under General details tab in Cluster tab

Change-Id: Ibe932731d7ec1913569e7f2f54c270b174eb6e36
Bug-Url:https://bugzilla.redhat.com/show_bug.cgi?id=1019570
Signed-off-by: Ramesh Nachimuthu <rnachimu@redhat.com>