ifupdown2 code was one level deeper because ifupdown2 initially
had ifupdown2 and ifupdown2-addons as two separate packages.
Since they were combined into one package, it makes sense to
move all combined code under the top level directory
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Ticket: CM-3346
Reviewed By:
Testing Done: Tested ifupdown2 sanity with all example files
(cherry picked from commit 40a3f646548c35bda34f4d41adb2e935374bb029)