The policy.v3cloudsample.json policy file attempted to solve
admin-ness issues with elaborate policy checks. These checks are no
longer needed with advent of system scope and incorporating system
scope into keystone APIs.
This commit removes the credential policies from the
policy.v3cloudsample.conf policy file since the new defaults introduce
more flexibility by consuming scope, rendering the policies in
policy.v3cloudsample.conf obsolete. More specific test coverage has
also been added for each new case in
keystone.tests.unit.protection.v3.test_credentials.
Change-Id: I6c74f40640da23375574f4a26ee60779ef08d120
Related-Bug: 1788415