Remove workaround for Ubuntu kernel permissions

Without the dependency on python-guestfs in Icehouse, we no
longer need to provide a workaround for Ubuntu kernel
permission issues on compute nodes.

Change-Id: Ib1d5225c138b1d9d63948b587ff53daded010100
Closes-Bug: #1343738
Merge "Remove workaround for Ubuntu kernel permissions" into stable/icehouse