Cherry-pick from 'release-0.4'

* Image builder update
  If359789737221c1ab6a19d060d1c45dcf9866282
  Conflicts:
    image-builder/config.ini

* Wrapper for 'pip install' added.
  I3e67a40e79cd62ffd31e71978f750997a35ea3f6
  Conflicts:
    devbox-scripts/murano-git-install.sh

* Cleanup action added
  Ic184bc5b66522ca91691baa07ceea0f838c9cabd

Change-Id: I6e0f27d396f6ef6c528b49cb146dac90029b9d87