Always trust the domain flags in the wcache trusted domain cache.

Always trust the domain flags in the wcache trusted domain cache.

Use the flags stored in the tdb when determining if a domain can
be contacted.  The tdb should be considered authoratative anyways unless
you know the flags in the winbindd_domain are correct (such as when
first enumerating trusts).

Original suggestion and patch from Steven Danneman <steven.danneman@isilon.com>.
Manually rewritten by me for 3.2.
(This used to be commit f53658a20de07a29abbe2e90917b328d00fc0024)