debian.py: Follow pep8 where possible.
debian.py: Follow pep8 where possible.

Some string templates defined in the file don't follow pep8.

superdump/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,sdroege/cerbero,lubosz/cerbero,fluendo/cerbero,centricular/cerbero,jackjansen/cerbero,ylatuya/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,BigBrother-International/gst-cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,justinjoy/cerbero,nirbheek/cerbero,flexVDI/cerbero,lubosz/cerbero,ramaxlo/cerbero,brion/cerbero,jackjansen/cerbero,ford-prefect/cerbero,superdump/cerbero,jackjansen/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,ikonst/cerbero,shoreflyer/cerbero,ikonst/cerbero,ramaxlo/cerbero,nzjrs/cerbero,GStreamer/cerbero,justinjoy/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,shoreflyer/cerbero,nirbheek/cerbero,sdroege/cerbero,BigBrother-International/gst-cerbero,GStreamer/cerbero,justinjoy/cerbero,GStreamer/cerbero,fluendo/cerbero,atsushieno/cerbero,nicolewu/cerbero,jackjansen/cerbero,EricssonResearch/cerbero,OptoFidelity/cerbero,AlertMe/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,cee1/cerbero-mac,shoreflyer/cerbero,flexVDI/cerbero,OptoFidelity/cerbero,atsushieno/cerbero,nirbheek/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,centricular/cerbero,davibe/cerbero,multipath-rtp/cerbero,ylatuya/cerbero,nirbheek/cerbero-old,AlertMe/cerbero,superdump/cerbero,nicolewu/cerbero,brion/cerbero,atsushieno/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,BigBrother-International/gst-cerbero,centricular/cerbero,ford-prefect/cerbero,ikonst/cerbero,cee1/cerbero-mac,atsushieno/cerbero,shoreflyer/cerbero,brion/cerbero,multipath-rtp/cerbero,BigBrother-International/gst-cerbero,ylatuya/cerbero,nirbheek/cerbero-old,atsushieno/cerbero,brion/cerbero,multipath-rtp/cerbero,jackjansen/cerbero-2013,jackjansen/cerbero-2013,sdroege/cerbero,flexVDI/cerbero,jackjansen/cerbero-2013,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,multipath-rtp/cerbero,AlertMe/cerbero,ikonst/cerbero,centricular/cerbero,superdump/cerbero,brion/cerbero,OptoFidelity/cerbero,ford-prefect/cerbero,sdroege/cerbero,lubosz/cerbero,shoreflyer/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,cee1/cerbero-mac,davibe/cerbero,ramaxlo/cerbero,jackjansen/cerbero-2013,AlertMe/cerbero,flexVDI/cerbero,ford-prefect/cerbero,GStreamer/cerbero,centricular/cerbero,nicolewu/cerbero,GStreamer/cerbero,BigBrother-International/gst-cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,davibe/cerbero,nzjrs/cerbero,nzjrs/cerbero,fluendo/cerbero,jackjansen/cerbero-2013,justinjoy/cerbero,ikonst/cerbero,nirbheek/cerbero,OptoFidelity/cerbero,davibe/cerbero,lubosz/cerbero,EricssonResearch/cerbero,ramaxlo/cerbero,multipath-rtp/cerbero,fluendo/cerbero,fluendo/cerbero,EricssonResearch/cerbero,nzjrs/cerbero,nzjrs/cerbero,ylatuya/cerbero,EricssonResearch/cerbero,AlertMe/cerbero,sdroege/cerbero,cee1/cerbero-mac,flexVDI/cerbero,ramaxlo/cerbero,EricssonResearch/cerbero,nirbheek/cerbero-old,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,nirbheek/cerbero-old,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero