In addition, add details in "show" command output.
Import command read certificate from filename provided and
registers it on backend. Only supported with storage type=none.
Syntax:
nsxadmin -r certificate -o import -p filename=<file>
nsx-list command lists certificates associated with openstack
identity on the backend, regardless of what certs are present in
storage. Currently up to one cert is supported per identity, this
will change in future. Syntax:
nsxadmin -r certificate -o nsx-list
Change-Id: I245d239942b0a85b67d263c3a6d51d228832f54b
ef5a7d611a