Merge branch 'devel-2.7'

Merge branch 'devel-2.7'

* devel-2.7: (26 commits)
  Fix burnin install path
  Fix format of the NEWS file
  NEWS: Add news entry for the hail disk policy fix
  Add shelltests verifying hail applies disk ipolicy per disk
  Make the disks parameter available to the constructor
  Verify individual disks in Instance
  Compatibility fix for GHC 7
  Properly update iv_name of disks while changing templates
  Limit the size of networks to /16
  Check minimum size of networks on creation
  Fix job queue directory permission problems
  The disk size of a diskless instance is 0, not None
  Postpone non-urgent TODO from 2.7 to 2.9
  Add tool for creating users and groups
  Backwards compatibility fix for Lucid
  Properly export errors while reading job list
  Fix typo and improve comment
  Fix a bug in the Runtime tests
  Restrict instance move to templates based on local files
  Introduce a constant for the copyable disk templates
  ...

Conflicts:
	NEWS: trivial
	lib/network.py: trivial

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Helga Velroyen <helgav@google.com>