Policy sample - Identity v3 resources management

Adds the following rules to ``etc/policy.v3cloudsample.json``,
providing an operational Identity v3 API enabled setting:

* The cloud_admin can manage users in any domain.

* The cloud_admin can manage roles on any domain.

* Domain administrators can manage roles on any project in their own
  domain.

Change-Id: Id6ea8f469d5d05c04042c1395c4eae85b982bb25
Closes-Bug: #1267187
deprecate stats middleware

Change-Id: Iba60958e18c2ccc41706c83d20b80a0bf1b13ad4
Implements: bp deprecated-as-of-icehouse
Make boolean query filter "False" argument work

Currently passing parameter=False returns the results
for parameter=True, so make the boolean evaluation of
the query string parameter more robust by using
oslo strutils.bool_from_string

Change-Id: I189a4f4a2e6448698903b949bdf74d5ef25d338b
Closes-Bug: #1267530
Merge "Make boolean query filter "False" argument work"
Merge "deprecate stats middleware"
Merge "Policy sample - Identity v3 resources management"