Update rack version for Puppet Dashboard 1.2.22.
Update rack version for Puppet Dashboard 1.2.22.

* manifests/params.pp: A new puppet-dashboard release, 1.2.22,
addresses several significant Rails vulnerabilities. However, it
also ups its rack dependency from 1.1.2 to 1.1.6. This change
mirrors that new requirement.

Change-Id: I59384d5bdf7b94a34dd78c19444280d946abb3bd
Reviewed-on: https://review.openstack.org/21913
Reviewed-by: Clark Boylan <635fc31d01fa593720982fa0568e87170cedbe2c@gmail.com>
Reviewed-by: James E. Blair <e81a02a9d6405977f63a769d9f6ec8ed9d924325@inaugust.com>
Reviewed-by: Elizabeth Krumbach <5ab9cdb82979a5e22201150e8d4ff9f187271b68@princessleia.com>
Approved: Jeremy Stanley <98883b97e35b7bb1ac282bb863f2e9d917db0454@yuggoth.org>
Reviewed-by: Jeremy Stanley <98883b97e35b7bb1ac282bb863f2e9d917db0454@yuggoth.org>
Tested-by: Jenkins

trafodion/puppet-dashboard,trafodion/puppet-dashboard