r19266: Add a target_hostname element to the binding struct. This allows us

r19266: Add a target_hostname element to the binding struct.  This allows us
to perform a lookup once, resolve the name to an IP, while still
communicating the full name to the lower layers, for kerberos etc.

This fixes 'net samdump', which was failing due to the schannel target
name being *smbserver.

Andrew Bartlett
(This used to be commit 0546f487f4cc99b5549dc1e457ea243d4bd66333)