reclass: maas: Dynamic machine definitions
Refactor maas machine definition flow from going through variables
in pod_config.yaml to directly handling it in Fuel using a new j2
template.
This prepares for future improvements allowing a dynamic compute
node count, as well as parameterizing new values via j2.
For now, node roles and count are still statically mapped to PDF
nodes.
JIRA: FUEL-319
Change-Id: I770d82987fcb99792f9d5bc0857ab513f5cd3731
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>