fabrics: Ensure host-traddr/iface consistency for "connect-all"

fabrics: Ensure host-traddr/iface consistency for "connect-all"

When using "connect-all --device" without specifying the options
--host-traddr and --host-iface, the children connections may not
have the same host-traddr/host-iface as the connection to the
discovery controller (DC).

This is specific to the --device option where one reuses a
persistent connection to a discovery controller to update the
discovery log pages (DLP) and connect to new controllers listed in
the new DLP. If --device is used w/o also specifying --host-traddr
and --host-iface, then the new connections may not use the same
attributes that were used for the DC connection.

This patch checks if --host-traddr and --host-iface have been
provided, and if not, it will use the DC's --host-traddr and
--host-iface for the new connections made as a result of changes
to the DLP.

Signed-off-by: Martin Belanger <martin.belanger@dell.com>