fabrics: only look for matching ctrl on same host

fabrics: only look for matching ctrl on same host

With the lookup_ctrl() check to prevent duplicate connections,
identical connections from different hosts are no longer possible.
Fix lookup_ctrl() to only look for matching controllers
on the same host that is being connected.
This restores the ability for multiple hosts on the same machine
to connect to the same transport addresses on the same subsystem.

Fixes: 07d6b91 ("fabrics: Do not attempt to reconnect to already
connected ctrls")
Signed-off-by: Caleb Sander <csander@purestorage.com>