The nova_security_group resource type and the nova_security_rule
resource type are dependent on subcommands of nova cli which were
already removed during Pike cycle[1][2]. This change removes these
invalid resource types.
Deprecation process is skipped because these resource types have not
worked as intended for a long period and we don't expect any user is
still using these invalid implementations.
[1] security group : a298b29cc7e6b7330945b1890f0a4bd4c9f3fde6
[2] security groip rules: 0896bdc52a307c0b9598da0b6b837a95f0c00b9a
Closes-Bug: #1941947
Change-Id: Ic72911bab169b0ab171a1701b6871a3d03f7951b
55874cb8ea