* stable-2.8: (45 commits)
  Update NEWS with disk creation fixes
  Sort cmdlib-related entries in Makefile.am
  cmdlib: Cleanup public/private functions
  cmdlib: Extract instance query related functionality
  cmdlib: Extract instance operation functionality
  cmdlib: Extract migration related functionality
  cmdlib: Extract storage related functionality
  Reformat and define exports in cmdlib/__init__.py
  Extract miscellaneous logical units from cmdlib
  Extract os related logical units from cmdlib
  Extract query related logical units from cmdlib
  Extract backup related logical units from cmdlib
  Extract instance related logical units from cmdlib
  Extract node related logical units from cmdlib
  Extract group related logial units from cmdlib
  Extract cluster related logical units from cmdlib
  Extract test logical units from cmdlib
  Extract network related logical units from cmdlib
  Extract tags related logical units from cmdlib
  Extract base classes from cmdlib
  ...

Conflicts:
	devel/build_chroot
	lib/cmdlib.py

devel/build_chroot is straightforward: one side has added versions, the
other has added one library. lib/cmdlib.py has been split in many files in
stable-2.8, so I've semi-manually applied the changes from master.

This merge also fixes a problem with merge f2d87a5e, which partially
reverted changes from 912737ba

 by mistake.

Signed-off-by: Bernardo Dal Seno <bdalseno@google.com>
Reviewed-by: Helga Velroyen <helgav@google.com>