UBUNTU: debian -- include the debian packaging in the -source package

BugLink: http://bugs.launchpad.net/bugs/608674

The -source package is a bootstrap package allowing other packages which
need the kernel source as part of their build process.  This allows
them to build depend on this package and have the source available.
Currently this only includes the actual kernel source which we built from.
In order to bootstrap compilers we consumers also need the rules used to
build the kernel.  Make a source version specific directory in /usr/src
and add the debian and debian.master contents.  Move the tarball into
this directory as well to better match other packages.  Finally include
a symlink from the original tarball name for backwards compatibility.

Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>