colord: add configuration to fix runtime

Make colord work out of the box

- We already create a colord user -> make use of it by passing the username
  to the 'daemon_user' meson option. The conf files and systemd service file
  will then be created accordingly.
- Add a backport patch to fix 'only root can write into /var' issue.
  This prevents colord from starting
  [https://github.com/hughsie/colord/issues/166]
- Set the runtime path for hwdata pnp.ids and
  add hwdata to RDEPENDS:${PN} for non systemd images
- inherit gtk-doc to make api-documentation available
- Dont create a home-dir for colord user. It shouldn't need one.

NOTE:
colord will fail on first run with missing databases.
After second boot it should run as expected.

Signed-off-by: Markus Volk <f_l_k@t-online.de>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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