[gnome-control-center] (3 commits) Non-fast-forward update to branch wip/msanchez/printers-clean-heads

[Mario Sanchez Prada <msanchez src gnome org>]

The branch 'wip/msanchez/printers-clean-heads' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  a54ef75... printers: Added new async API to check availability of main
  0e025ef... printers: Check all supported CUPS commands, not just the f
  1e44577... printers: Expose the newly added 'Clean' maintenance comman

Commits added to the branch:

  5da4253... printers: Added new async API to check availability of main
  a77f744... printers: Check all supported CUPS commands, not just the f
  017c691... printers: Expose the newly added 'Clean' maintenance comman