Running Octave tests under xvfb

[Rafael Laboissière]

Running the unit tests in some Octave add-on packages fails because some 
of them use graphical output (e.g. [1]).  One possible way to fix the 
problem is by running the tests under xvfb.  I did the changes to the 
Octave support of autodep8, which are now in the branch called 
octave-xvfb [2].  For your convenience, I am attaching below the diff 
between branches master and octave-xvfb.

If nobody objects, I will merge the branch into master and upload a new 
version of the package to unstable.  We will need also to upload a new 
version to stretch-backports, such that ci.d.o will behave correctly.

I am Cc:ing this message to the DOG mailing list, so that the Octave 
folks can also comment on this change (hopefully it will not break 
anything).

Best,

Rafael Laboissière

 [1] https://ci.debian.net/data/autopkgtest/unstable/amd64/o/octave-stk/20171016_204101/log.gz
 [2] https://anonscm.debian.org/cgit/collab-maint/autodep8.git/log/?h=octave-xvfb
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