s4:librpc: raise log level for failed connection attempts

s4:librpc: raise log level for failed connection attempts

this keeps the log files silent when other DCs are currently not running. We
saw frequent NT_STATUS_HOST_UNREACHABLE messages at log level 0 for now.

https://bugzilla.samba.org/show_bug.cgi?id=11537

Signed-off-by: Bjoern Jacke <bjacke@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Sun Jan 23 12:51:44 UTC 2022 on sn-devel-184