Fix known hosts config script value
Fix known hosts config script value

There was an extra | that was missed. It's not tested in Master but is
in <= Queens.

Change-Id: If7a4c6f3581bed270f478b98b8da8fe010acbbc1
Closes-Bug: #1772071

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