New scheme mainly provides three packages: openvswitch,
openvswitch-ovn-north, openvswitch-ovn-controller.  These should fit
most usage scenarios.  Other subpackages like openvswitch-libXXX
etc.  are there for dependency management and are hidden from the
menu.

Many python and shell scripts are removed in this revision.  Most of
them cannot run out of box at all for lack of dependencies.  Others
being legacy ones are not that useful now.  Add them back at later time
when real need appears

Below are a simple listing of additions

 - initscript now incorporate also ovn north and controller support
 - ovn-ctl and ovs-ctl can be invoked directly from within $PATH

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

I should have packaged the OVN stuff, VTEP and what-not
earlier, but was not inspired to do this earlier.

I made some time now to package those parts.

Disabling flake8 & python3 explicitly.
They might get detected and cause weird build errors.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

This is default if ovs is started through ovs-ctl but we start it directly, hence
tell procd to use nice -10 for ovs.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>