removed powermanagement-interface (not available in debian/wheezy)
added upower (power) and pulseaudio-utils (audio) to plans
don't clobber files already in /root when applying skel .bashrc.d and .profile.d

rational:

1) it's useful to be able to override root skel files in the overlay
2) conf scripts are run after the overlay is applied so we need to ask cp not
   to clobber files already in there.
moved and renamed /root/.profile.d/turnkey-init-firstlogin from headless patch

Changes:

- Renamed from /root/.profile.d/turnkey-init-firstlogin =>
  /root/.profile.d/turnkey-init-fence

  Rational: Because you shouldn't name a thing after a subcomponent. firstlogin
  is only part of the mechanism.

- Moved from headless patch to common/overlays/turnkey.d/turnkey-init-fence

  Rational:

  - its better to have this documented in common/
  - we want this mechanism in all builds, not just the headless builds. This
    makes it easier to examine the mechanism from a non-headless installation
    and also makes it easier to activate if necessary.
Merge remote-tracking branch 'liraz/master'