fabrics: fix fc config JSON file handling

fabrics: fix fc config JSON file handling

Unlike other nvme transports, nvme/fc connection requires a valid
host_traddr in addition to traddr and transport type. Current fc
config JSON handling is broken due to the host_traddr not getting
updated even if explicitly listed in the JSON file, as shown below:

nvme connect-all -J /usr/local/etc/nvme/config.json
Failed to write to /dev/nvme-fabrics: Invalid argument

And the below error is logged in the messages file for the same:

nvme_fabrics: missing parameter 'host_traddr=%s'

Fix this by ensuring the relevant host_traddr string is appropriately
passed to the respective nvme controller structure. And while we are
at it, ensure the host_iface string is updated too but noting that it
is only applicable to tcp alone, and not rdma or fc.

Signed-off-by: Martin George <marting@netapp.com>