debian: Move Debian packaging Python code into a lib directory

Signed-off-by: Euan Harris <euan.harris@citrix.com>
debian: Move Debian-specific scripts into scripts/deb

Signed-off-by: Euan Harris <euan.harris@citrix.com>
configure: Split out RPM and DEB configure scripts

Signed-off-by: Euan Harris <euan.harris@citrix.com>
makemake: Libraries are now in scripts/libs

Signed-off-by: Euan Harris <euan.harris@citrix.com>
scripts: Move RPM-specific scripts to scripts/rpm

Signed-off-by: Euan Harris <euan.harris@citrix.com>
debian: Move Debian configuration files to scripts/deb

Signed-off-by: Euan Harris <euan.harris@citrix.com>
debian: Add make install target

This target will configure Apt to install locally-built packages,
and install xenserver-core.

Signed-off-by: Euan Harris <euan.harris@citrix.com>