Migrate heat-engine element to svc-map

This patch migrates the heat-engine element from map-services
to svc-map by adding a svc-map file and adding the -a option to
os-svc-install script calls.

Change-Id: I1dc31cf388cb26996d693554d3250a60a9b0e010
Merge "Migrate heat-engine element to svc-map"