torture: Address flapping samba4.rpc.altercontext test

torture: Address flapping samba4.rpc.altercontext test

NT_STATUS_CONNECTION_DISCONNECTED and NT_STATUS_CONNECTION_RESET are
equivilent for the purposes of this test, both come from the server
shutting down the connection, the difference comes from two different
unix error numbers that can come from this.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Mon May 20 05:17:42 UTC 2019 on sn-devel-184