move multinode scen006 to experimental
move multinode scen006 to experimental

scenario006 is failing for a long time.
Move out of check and into experimental
http://zuul.openstack.org/builds?job_name=tripleo-ci-centos-7-scenario006-multinode-oooq-container

Change-Id: Ie5cbc9285667c039659ecbd733b8e93205eb63a1

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