s3:rpc_client: reverse rpccli_{is_connected,set_timeout}() and rpccli_bh_{is_connecte...

s3:rpc_client: reverse rpccli_{is_connected,set_timeout}() and rpccli_bh_{is_connected,set_timeout}()

rpccli->transport should never be used directly,
everything should go via the binding handle.

Internal pipes don't have a transport, so p->transport is always
NULL. rpccli_is_connected() checks this and this causes all SAMR and LSA
requests for the local domain to be processed a second time by the triggered
retry logic.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14457

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>