minor refactoring
Revert "chef bootstrap should always run 'apt-get update'"

This reverts commit 574e3bba9c71cdea1dddab39ac459ba3bed3f487.
We decided to not do cache update from here, but instead make it more
visible by adding it in the chef runlist
included Avishai's cloudify-chef integration cookbook - wip
added the recipe cloudify::common to include apt on ubuntu