Fix Policy action "get_flavors" not found

The "get_flavors" policy has been removed since the Neutron uses policy
in code.
Patrole should test against the "get_flavor" policy and use the
"override_role_and_validate_list" function for validation.

Change-Id: Ibbe4e7e3dec27c56d4fd8990b77910866a694a3e
1 file changed