nomerge: allow the YumPayload to be instantiated again.
nomerge: ignore OSErrors when delting logs in run.py
nomerge: f19 is released now, tweak the ks file.
fix nonexistent exception name in dnfpayload.
nomerge: dnf_img_test/run_yum.py.

Sometimes I want to see things still run with the YumPayload.
nomerge: .gitignore update.