BindingXMLRPC cleanup: Inline getServerInfo

Inlining getServerInfo because:
1) It's used exactly once
2) I'd like to avoid people using it at all. It only works
   if there's exactly one client, and only for one command
   at a time. It works for the purposes it's used, but if
   (code) users expect it to work for all cases they'd be
   in for a surprise

Change-Id: I9f19630f995c2fe9fb3e3c11e4027f22f98722ba
Signed-off-by: Assaf Muller <amuller@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/22835
Reviewed-by: Dan Kenigsberg <danken@redhat.com>