Remove incorrect legacy meta.openstack stub element
Remove incorrect legacy meta.openstack stub element

 See thread at https://groups.google.com/a/cloudfoundry.org/d/msg/vcap-dev/pGqlNn_MOO0/C1bU8vHPwIMJ.

 Merge of https://github.com/cloudfoundry/cf-release/pull/635 is a prereq, otherwise spiff stub will complain its missing

cwest/docs-deploying-cf,shalako/docs-deploying-cf,cloudfoundry/docs-deploying-cf,njbennett/docs-deploying-cf,bridgetkromhout/docs-deploying-cf,jpalermo/docs-deploying-cf