Keep output of git "live" (Meaning that one can see live what submodule
is currently pulled) by not saving it first and then grepping but by
catching a failing grep when the output of git was empty.
Move long commands from the dotbot config into own scripts to keep the
install.conf.yaml more readable.
Fix bug that the submodule init step fails when already done once since
then the grep statement fails because there is no output.