tests: move bier tests to src/vnet/bier/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: I17003925be06d1051f18f1c24ff081790a610c23

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

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