Get rid of python2

See https://wiki.gnome.org/action/edit/Initiatives/GnomeGoals/Python3Porting

Current modules using python2:

• gegl !691 (merged)
• gjs port to mozjs 78 gjs!458 (merged)
• libmbim
• libqmi
• libvirt
• mozjs52 !151 (merged)
• mozjs60 https://bugzilla.mozilla.org/show_bug.cgi?id=1388447
• PackageKit
• samba https://bugzilla.samba.org/show_bug.cgi?id=10028 !236 (merged)
• tracker !172 (merged) tracker#63
• volume-key !150 (merged)
• WebKitGTK+
  • !193 (merged)
  • https://bugs.webkit.org/show_bug.cgi?id=184986
  • https://build.opensuse.org/package/view_file/GNOME:Factory/webkit2gtk3/webkit2gtk3-python3.patch?expand=1