Small fixes to the deployment scenario framework:

Small fixes to the deployment scenario framework:

- Added deploy.sh -d option for dryrun. With -d + all the other mandatory
  arguments, deploy.sh produces ci/config/dea.yaml and /ci/config/dha.yaml
  with out actually deploying the stack.
- Bugfix to exit with rc <> 0 if deployment fails.
- Don't delete the programatically constructed dea.yaml or dha.yaml
  under fuel/ci/config after deploy has finished.
  dea.yaml and dha.yaml are needed functest, therefore these files
  must not be deleted after deployment has finished. They will reside
  in fuel/ci/config/.
- Dont merge the dha-override section in deployment scenarios with the final
  dha.yaml unless the deployment is virtual. There is no way you can
  programatically override physicall resources, wireing, ipmi set-up, etc. -
  while you can for virtual environments.

VERIFIED
READY TO MERGE

Change-Id: If4dedc472e07ed60071ee34c73db29f3b9c45252
Signed-off-by: Jonas Bjurel <jonas.bjurel@ericsson.com>
(cherry picked from commit c6a9f766792032a4cc84bc801e15b05a29f09e8e)