deploy/heat: make sfconfig.sh bootstrap optionnable
deploy/heat: make sfconfig.sh bootstrap optionnable

By default it uses the default behavior by boostrapping but
add an option to run a HEAT deployement without running
sfconfig.sh. This can be useful for an experimented operator
that want to custom directly the sfconfig.yaml before the
first run.

The pre-production VM will use that feature.

Change-Id: I5b68a0666745d6188e005b835a817a37d1314132

enovance/software-factory,enovance/software-factory,enovance/software-factory,enovance/software-factory,enovance/software-factory