gssd: Remove insane sanity checks of the service name

Either we trust the info file, or we don't. The current
'checks' only work for the combination 'nfs', '100003' and
a version number between 2 and 4.
The problem is that the callback channel also wants to use
'nfs' in combination with a different program number and
version number.

This patch throws the bogus checks out altogether and lets the
kernel use whatever combination it wants....

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Steve Dickson <steved@redhat.com>