openstack: rm all folsom/essex files, templates

afaict when looking at site.pp we
use openstack version 'havana' everywhere
meanwhile and not 'folsom' anymore

i notice these files because they have a lot
of hardcoded 'pmtpa' in them, so most likely
they wouldn't work anymore

instead of editing them, can we just delete
the entire files/folsom/ ? it doesn't seem
to me like any manifest installs a file
from this directory either

per comment from Andrew on PS1, also removing
all templates and 'essex' as well

Change-Id: I5ddc43e4425fe96776ce45f1a9f91ab1870692c8
Merge "openstack: rm all folsom/essex files, templates" into production