Add target_branch for gen_config_patches.sh

To support new config updates in other brances besides os-build, we need to be more flexible with the staging branch. Currently new configs get added to configs/$date/. This won't work when new branches like os-build-rt-devel and os-build-automotive-devel get implemented as they will have duplicate entries here and cause script problems. Add a $branch name into the configs path to create separation.

configs/$date/ --> configs/target_branch/date/

This is not expected to impact anything else.

Signed-off-by: Don Zickus dzickus@redhat.com