The "images" environment has sitepackages=True, required by the
Python binding for libguestfs (not on pip).
Also, set the Ubuntu kernel so that it can be read by normal.
This affected (and was fixed) many other users of libguestfs. See:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/759725
Change-Id: Icf21a7ee9b575d832d6be5e662d4cfa7b8933611