Move some things around again

What I'm working on here is somehting like this:

1. Move the image-utils code out of Cinder and into brick
        In the future this may be OSLO, or it may stay brick
		or something else...
2. Add a connectors section
        One of the things we need/want to address in Cinder
		is avoid duplicating the iscsi attach/connect code
		etc from Nova.  Putting this in a lib would be a win
3. Have a Cinder branch that's replacing volume.drivers.lvm
       that just uses/calls brick