set_dc_type_and_flags_trustinfo: Use init_dc_connection and wb_open_internal_pipe

set_dc_type_and_flags_trustinfo: Use init_dc_connection and wb_open_internal_pipe

This means we call this code, and mark trusted domains as active directory, when we are an AD DC.

Otherwise, in the previous case we would not have domain->active_directory set, and would fail on
connection_ok() due to not having a full connection to our internal DC

Change-Id: I7ccee569d69d6c5466334540db8920e57aafa991
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>