webadmin: UI-Plugins - fix host name mapping

EntityObject:
* Map 'getvds_name' to 'name' property (Name column).
* Map 'gethost_name' to 'hostname' property (Hostname/IP column).

Change-Id: Id947436ccdf2a5654ca6852f6e57af143dad8b21
Signed-off-by: Daniel Erez <derez@redhat.com>