Stop develop slapos-cookbook, use eggs instead
There is no reason to git clone by default, as slapos.cookbook should be developed independently.
Anyone an include develop, locally, to test on the edge changes, or include local modification when they use webrunner or a development server.
@vpelletier @jm @jerome @kazuhiko does anyone has any objection on this change? I just released slapos.cookbook with latest changes (so no regration might be found).
Perhaps is better include this on a staging testnode before merge (not sure it is required).