Support adding a swap file to overcloud nodes
Support adding a swap file to overcloud nodes

Create a new SoftwareDeployment that can be used to add a swap file to
all nodes The amount of swap and the location of the swap file can be
customized via parameter_defaults and the swap_size_megabytes/swap_path
parameters.

Change-Id: I1fb14c0fab2255410fceb26c3a7d5cfe0ba57b3b

bcrochet/tripleo-heat-templates,trozet/opnfv-tht,dprince/tripleo-heat-templates,bcrochet/tripleo-heat-templates,openstack/tripleo-heat-templates,bcrochet/tripleo-heat-templates,trozet/opnfv-tht,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,trozet/opnfv-tht