Reintroduce support for provider networks

There are two problems with provider networks:

First, the way bridge mappings are done
prevents users from having mutliple
provider networks. This patch allows
the user to pass them in directly.

Second, change 38426 proposes changing
the behavior of network_vlan_ranges
and this patch will reflect that by
passing down undef unless the user wishes
to override the defaults specified
in quantum::plugins::ovs

Change-Id: I36b11f9e0fa5458e50cbe59c8f4a5d1f3d9bdaa6
Create a mailmap

  - This patch adds a mailmap which is aim to map
  addresses in bzr to people's real,preferred e-mail addresses.
  - Add an alias for Xingchao Yu.

Change-Id: I427ef5bdfbf636476f3b788a9642abcb285fc775
add rbd backend support to glance

Change-Id: I03b59e627b66e744a6efe45db24b8929e75f5e2e
Update the specification in openstack::keystone

This patch is aim to update the option names in specification
and the use example.

Change-Id: I5ae49b1a929cfeebe94dbf25435f8e3328fb8216
Merge "Reintroduce support for provider networks"
Merge "Create a mailmap"
Merge "add rbd backend support to glance"
Merge remote-tracking branch 'upstream/master' into grizzly