fa_build_image doesn't support "--force" option

[Dmitry Burmistrov]

Detailed bug description:
 After building image "fa_build_image" doesn't rebuild it and there is not option to override this behavior. If package list in Fuil web ui is changed re-deploy won't help.
 Settings changes can be checked, on "deploy" action image can be rebuilt, "fa_build_image" should provide options to rebuild image manually.
Steps to reproduce:
 Deploy new cluster (build from master/MOS 10), but make it fail in early puppet stages.
 Update package list in Fuel web ui settings.
 Run "fa_build_image" twice.
Expected results:
 fa_build_image:
   Without extra options: image is not rebuilt.
   With some option like "--force/--override/--rebuild": image is rebuilt.
 Pressing "deploy" second time in Fuel web ui should trigger image rebuilding process.
Actual result:
 Image is not rebuilt.
Reproducibility:
 -
Workaround:
 -
Impact:
 -
Description of the environment:
 Operation system: Ubuntu 16.04
 Versions of components: -
 Reference architecture: -
 Network model: -
 Related projects installed: -
Additional information:
 -

[Aleksey Zvyagintsev (azvyagintsev)]

Since it ran be simple fixed :
rm -f /var/www/nailgun/targetimages/env_*_ubuntu_1404_amd64*
moving to wishlist