Add missing user-id option to generic.Password
Add missing user-id option to generic.Password

The user_id field is available when constructing the plugin from python
however the option is not listed in the get_options list.

Change-Id: I036c4a49f58e4412c6cfb477b56b31b7b965c2fb

sileht/keystoneauth,jamielennox/keystoneauth,citrix-openstack-build/keystoneauth