Replace nagios3 template with HOT rewrite
Replace nagios3 template with HOT rewrite

Rewrote template from scratch using HOT. Mail delivery does not work yet
but it does produce Nagios.

Change-Id: I347f8a008aa7db1145da0988053c791e6f2dbbc2

dprince/tripleo-heat-templates,rdo-management/tripleo-heat-templates,rdo-management/tripleo-heat-templates,redhat-openstack/tripleo-heat-templates,trozet/opnfv-tht,bcrochet/tripleo-heat-templates,redhat-openstack/tripleo-heat-templates,openstack/tripleo-heat-templates,openstack/tripleo-heat-templates,wyg3958/tripleo-heat-templates,trozet/opnfv-tht,trozet/tripleo-heat-templates,wyg3958/tripleo-heat-templates,bcrochet/tripleo-heat-templates,bcrochet/tripleo-heat-templates,trozet/tripleo-heat-templates,dprince/tripleo-heat-templates,trozet/opnfv-tht