This is a follow-up patch of https://review.openstack.org/#/c/627741/
Create RBAC policy form:
* Merge "Action" and "Object Type" choices into a single drop-down menu.
There is a constraint between an object type and an action and
"access_as_external" is not a valid action for "qos_policy" object type.
It sounds reasonable to merge "action" and "object type" into a single
list to avoid confusion.
* Add "Select a Network" and "Select a QoS policy" to the choices of
a target network and a target QoS policy.
Edit RBAC policy form:
* Add "*" (all projects) to "Target Project".
Part of blueprint rbac-policies
Change-Id: I135b5e5b0d4a0d8f55830ac649171e6e350db3ba