tests: move bfd tests to src/vnet/bfd/test

- Refactor make test code to be co-located with
  the vpp feature source code.

Type: test

Signed-off-by: Dave Wallace <dwallacelf@gmail.com>
Change-Id: I3ef69bc915d2217357a9e2b1afa1cfd6c363faa0

diff --git a/test/bfd.py b/src/vnet/bfd/test/bfd.py
similarity index 100%
rename from test/bfd.py
rename to src/vnet/bfd/test/bfd.py

diff --git a/test/test_bfd.py b/src/vnet/bfd/test/test_bfd.py
similarity index 100%
rename from test/test_bfd.py
rename to src/vnet/bfd/test/test_bfd.py