sprinkler-image: refactor image

Move package install list around so that basic stuff
is at the top, followed by the stuff we need for this
image.

Also remove the explicit use of node; my new script
doesn't need it, it may be installed by beaglebone-
getting-started. I don't need it for anything else.
sprinkler-image: remove unneeded stuff

We don't need a commented out like adding ext3 as an image type
nor do we need to specify the init manager.
techworks.conf: Add default providers and versions
cronie: rename bbappend to match oe-core.