add nova source install and apply it to compute-api
install packages required by pip
apply nova source install to compute recipe
add chef-rewind gem install to compute-api recipe
move novnc files to a remote folder
set an attr for the novnc download url
set an attr for the nova git repo and ref
Merge pull request #25 from chamankang/UCLOUDNG-687

Ucloudng 687
don't run api-metadata on compute node