Updated openstack/openstack
Project: openstack/keystone  25508f2c0af859300ddf3247ed91019aa9801d0d
null
Update config options with helpstrings and generate sample

Restructure the common config to include many help strings to
support using the oslo.config auto-generated sample config file.

Closes-Bug: #1229941
Change-Id: If352b3b816b1e7dc8b5fc3b9c1cb2adab187ffda