Bug#565973: cdbs should not use --prefix, but --install-layout=deb

[Piotr Ożarowski]

--install-{pure,lib} is used later anyway, so --install-layout=deb
will not change much (and please don't mention tarball workaround used in
Ubuntu).

both dh_pycentral and dh_pysupport move files from site-packages to
dist-packages, so #567745 is not relevant.

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