[ Reason ]
Skip two flaky tests which make the package to FTBFS. Bug #1102300.

[ Impact ]
Users trying to rebuild from source might find that the package unexpectedly
fails to build.

[ Tests ]
I've checked that the package builds ok on the systems where it used to fail.

[ Risks ]
Very low. No code changes, we are merely disabling two tests.

[ Checklist ]
   [X] *all* changes are documented in the d/changelog
   [X] I reviewed all changes and I approve them
   [X] attach debdiff against the package in (old)stable
   [X] the issue is verified as fixed in unstable

[ Changes ]
Skip two tests.

[ Other info ]
Change is trivial, I've already uploaded the package.