Master branch is now tracking development of SSSD 1.13

[Jakub Hrozek]

Hi,

I branched off sssd-1-12, which means that a) we can finally push some
patches that were delayed because we wanted to avoid breaking 1.12 and
b) all patches that should be fixed in 1.12.x need to be pushed to both
sssd-1-12 and master.

Happy coding!