Tcpdump has a fairly small footprint and should be installed to all images (it currently is on the ubuntu image by default). Sometimes the reason you need it is also the reason its to late to get it. Change-Id: I4849157515b389d534bdee755cdac6b0768fcb29
Use Fedora cloud images as the baseline for built disk images.
Overrides:
- To use a non-default URL for downloading base Fedora cloud images, use the environment variable DIB_CLOUD_IMAGES
- To download a non-default release of Fedora cloud images, use the environment variable DIB_RELEASE