[gnome-software] (9 commits) ...Move upgrade download from packagekit-refine plugin to packagekit plugin

[Kalev Lember <klember src gnome org>]

Summary of changes:

  8d293f1... Wire up system upgrade triggering through the plugin loader (*)
  2ef10fa... update monitor: Don't warn when no upgrades are available (*)
  01725d6... upgrade banner: Add public get_app/set_app() API (*)
  eb6bb8a... Hook up upgrade installation to the updates page (*)
  5e5f1c5... Correctly pass down the distro upgrade version to PK (*)
  d768d8c... dummy plugin: Switch the dummy upgrade test to rawhide, ins (*)
  2be2b19... Correctly update app states during distro upgrade phases (*)
  6233cef... upgrade banner: Call refresh() each time download progress  (*)
  c6c9b8a... Move upgrade download from packagekit-refine plugin to pack (*)

(*) This commit already existed in another branch; no separate mail sent