Remove spurious for loop from post deploy j2
Remove spurious for loop from post deploy j2

This nested for loop is wrong as it generates all steps for all
roles twice.  This works because yaml parsing ignores the duplicate
resources, but it's a big waste of space in swift (this fix reduces
the rendered file size by over 2000 lines with the default roles!)

Change-Id: Ifaf860020839390147c92848d52b1a59e355dc50
Closes-Bug: #1659139

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