winbindd: call reset_cm_connection_on_error() from reconnect_need_retry()

winbindd: call reset_cm_connection_on_error() from reconnect_need_retry()

This ensures we use the same disconnect logic in the reconnect backend,
which calls reconnect_need_retry(), and in the dual_srv frontend which
calls reset_cm_connection_on_error.

Both reset_cm_connection_on_error() and reconnect_need_retry() are very
similar, both return a bool indicating whether a retry should be
attempted, unfortunately the functions have a different default return,
so I don't dare unifying them, but instead just call one from the other.

Bug: https://bugzilla.samba.org/show_bug.cgi?id=13332

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
(cherry picked from commit 2837b796af3e491b6bb34bd441758ae214f629ee)