build: initial pybuild based deb packaging

Initial version of deb pkg, based on pybuild. Reverted to classic
setup.py, because debian tooling does not yet understand the newer
pyproject.toml.

Yamale is absent from the list of package dependencies as there is as
yet no upstream debian packaging for it, will need to work around with
documentation and install with pip for the moment. Autotest of the
debian packaging is also disabled for the moment.

Systemd service is automatically installed and bould to the vpp
service, but does not become active until the user creates the
configuration /etc/vpp/config.yaml

Signed-off-by: Ray Kinsella <mdr@ashroe.eu>

README.md

@@ -25,8 +25,9 @@ $ make build
 ## Install the tool with PIP
 $ make install
 
-###
-
+## To build & install debian packaging
+$ make pkg-deb
+$ sudo deb -i ../vppcfg_0.0.1_amd64.deb
 ```
 
 ## Running