update keystone config file to support purging

 basically the same as: https://github.com/puppetlabs/puppetlabs-glance/pull/68
Merge pull request #120 from bodepd/support_purging

update keystone config file to support purging
release 1.1.0
Merge pull request #125 from bodepd/1_1_0

release 1.1.0
Merge remote-tracking branch 'origin/folsom'
Merge pull request #127 from bodepd/merge_folsom_changes

Merge folsom changes
Merge pull request #128 from bodepd/merge_folsom_changes

Merge folsom changes
update 1.1.1 release
Merge pull request #129 from bodepd/1_1_1

update 1.1.1 release
Merge pull request #130 from bodepd/1_1_1

1 1 1
Merge pull request #133 from puppetlabs/master

backport 1.1.0 release to folsom branch
Merge branch 'dev' of https://github.com/gwdg/puppetlabs-keystone into dev