nvme-cli: extend ctrl_list_item for connect attributes

nvme-cli: extend ctrl_list_item for connect attributes

In preparation for searching controllers to match with connect args:

Extend the ctrl_list_item with elements that can be compared against
connect arguments. Extend the get_nvme_ctrl_info() routine to set
the fields.

subsysnqn was added as the ctrl_list_item may now be used outside of
a subsystem listing.

traddr, trsvid, and host_traddr are added. Their values come from
the address attribute.  A new parsing routine was added that extracts
the values from the address string.

The new parsing routine and supporting field names strings are
declared as a global interface as a subsequent patch will call it
from the fabrics routines.

Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Hannes Reinecke <hare@suse.com>