make skydive working with folder created by tripleo-admin
make skydive working with folder created by tripleo-admin

Makes /var/lib/mistral/overcloud/skydive be owned by
tripleo-admin so that playbook and vars files can be written.

Change-Id: I72e396747f487a76822f18906edfb8c015b7dd36

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates