Update the README with new Wiki page
Update the README with new Wiki page

Update the README indicating the new wiki page:
https://wiki.openstack.org/wiki/Puppet-openstack/puppet-openstack-cloud

Change-Id: I4460bf5f2bf2ce1e858e23a89421b19d003fe501
(cherry picked from commit c44bf8190d0fd8faa803328e98c8b9b542598688)

goneri/puppet-openstack-cloud,Prophidys/puppet-openstack-cloud,goneri/puppet-openstack-cloud,Prophidys/puppet-openstack-cloud,Prophidys/puppet-openstack-cloud