fabrics: fix endless loop in connect-all for NVME_NQN_CURR

fabrics: fix endless loop in connect-all for NVME_NQN_CURR

For a discovery log page entry that indicates the discovery controller
that returned it (i.e. itself), we need to set the controller as
discovered (because we got the discovery log page by connecting to it).

Without this connect-all goes in an endless loop keep connecting and
retrieving the log page from the same discovery subsystem port.

Fixes: 06a8f001d314 ("tree,fabrics: detect discovery loops")
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>