This reverts commit 870be44c0ed5564101f9cf9d53e8085fb01680c8.

This change breaks end users of the library. See:

http://logs.openstack.org/50/285450/1/check/gate-shade-dsvm-functional-keystone2/d1093b5/console.html#_2016-02-26_20_49_32_928

For an example of a consumer of the library being broken.

Change-Id: I1912003afb89579eb869767db7a411c451bc9806

Create a custom list with flag `truncated` to support corresponding
response from the identity service.

This is wanted by Horizon, that wants to know that the list returned
from keystone is not full and that more strict filters need to be
applied.

The previous attempt in commit c28d40814962b3a8ccb81e5e7d7f832c8f0a3c9a
was reverted by d20b300589863bcf165945beb129ebcc3621a14f because it
broke other code. This commit changes the way the flag is added and
verifies that existing code will not break.

Change-Id: Ia86cfd91110adae6d7ab86ff1f152a8f9be27837
Closes-Bug: 1520244

Add support for the domain_id attribute in the role entity.

Partially Implements: blueprint domain-specific-roles
Change-Id: I06af7647e15aa742609b3fe1b9b222fbeaeb5735

While the entity for an inference rule should be thought of as a
resource, the rules are essentially relationships between roles.
The `implied_role` API is linked with the role API, and thus the
client functions are part of v3/role.py.  However, it does not
map completely cleanly to the Crud baseclass, and requires
some custom URL generation.

Change-Id: I80a40e88b571fe9b0eca3af8b705ea79f28eb904