[Reviewer: AMC] Move sprout.init.d to sprout-base.root

Moving the sprout.init.d script to sprout-base.root/etc/init.d so that it gets installed with sprout-base (and therefore all sprout based packages.

Previously no init.d scripts were being installed with sprout-base. This is the simplest fix (that still allows us to run service sprout start etc as opposed to service sprout-base start).

I've tested by using chef to spin up a sprout node and a pogo node. Both worked well.