r21132: - Fixes bug 4366. Documentation for smbc_utimes() was incorrect.

r21132: - Fixes bug 4366.  Documentation for smbc_utimes() was incorrect.

- Should fix bug 4115 (but needs confirmation from OP).  If the kerberos use
  flag is set in the context, then also pass it to smbc_attr_server for use by
  cli_full_connection()

- Should fix bug 4309 (but needs confirmation from OP).  We no longer send a
  keepalive packet unconditionally.  Instead, we assume (yes, possibly
  incorrectly, but it's the best guess we can make) that if the connection is
  on port 139, it's netbios and otherwise, it isn't.  If netbios is in use, we
  send a keepalive packet.  Otherwise, we check that the connection is alive
  using getpeername().