Updated openstack/openstack
Project: openstack-dev/devstack  a8f0d966a159220af11fe0171ae6dca24bc51b97

Change httpd Keystone log to keystone.log

The normal extension for log files is .log. Log rotation should
work because the extension is as expected.

Change-Id: Ia5e42ea9d953e8395b86ab58cdef6c2d852efc94
Related-Bug: #1359995