shared rpc handles

[tridge at samba.org]

Metze,

 > Currently it's just NET-API-BECOME-DC
 > 
 > feel free to write some tests, also the PFC_CONC_MPX flag should have
 > sometests...

I've just added the RPC-HANDLES test, which tests lsa, samr and
drsuapi (via a DsBind) to see if policy handles are shared. In each
case the test shows they aren't (with a w2k3 server).

Can you take a look and see what I might have missed?

Cheers, Tridge