b=24416 debian packaging fixes

b=24416 debian packaging fixes

- don't make a patch out of anything in /debian
- exclude noise files from the debian built source tarball
- fake debian/patche{s,d} for make dist
- a few more reasons to run autogen.sh
- figure out if dist tarball needs autogen.shs and include it if so
- look for and run autogen.sh in the build subdir
- make debdiff as part of make dist
- add a debian/source/format file
- mv the orig tarball and the debdiff to the debs dir
- don't try to dist /debian for non-dpkg-using build targets

Issue: LU-51