Remove old sdewan controller code

Remove old sdewan controller code

As we re-design/re-implemente the sdewan controller, new controller code
will be checkedin soon. I would like to remove the old controller code,
so that the reviewers can focus on the new implementation regardless of
the old version.

Signed-off-by: chengli3 <cheng1.li@intel.com>
Change-Id: If4915a57e568d6dd9c5fcf4b82a7c9867ae9c32e