Travis failures in jfx-11 branch

[Johan Vos]

I noticed Travis fails a number of times on branches.
For example: https://travis-ci.org/javafxports/openjdk-jfx/builds/419599353
This is the exact commit that worked fine in the development branch.

>From the logs, it seems that the failures occur when all the packages have
to be installed:


Setting up libudev1:amd64 (204-5ubuntu20.28) ...
Setting up udev (204-5ubuntu20.28) ...
runlevel:/var/run/utmp: No such file or directory
invoke-rc.d: initscript udev, action "restart" failed.


On successful builds, this apt-get install command is not executed.

- Johan