Add config for visibility of cisco-policy-profile

This change adds a configuration option to cisco_plugin.ini to control the
visibility of cisco-policy-profile among tenants. The default is false or
unrestricted, so all tenants can view all policy profiles. If the option
is set to true, tenants can only view policy profiles that are assigned
to that tenant. The admin user can always view all policy profiles. This
was implemented by adding a check of the configuration option in
get_policy_profiles().

Change-Id: I5d77544d75366d39714def971eb949cfdc40023e
Implements: blueprint cisco-policy-profile-visibility
Merge "Add config for visibility of cisco-policy-profile"