Split autoupdate into two seperate git commands
Split autoupdate into two seperate git commands

As described in https://stackoverflow.com/questions/35842492/git-cannot-rebase-onto-multiple-branches
it can sometimes happen that 'git pull --rebase' results in
'fatal: Cannot rebase onto multiple branches.'.
Therefore the split into two seperate commands like introduced by
@okurz for the original logwarn script.

okurz/openqa_monitoring