Teardown the testing tunnel in the end of migration tests

This patch makes sure the IPsec tunnel is torn down in the end of
the test so that if one test fails, the following tests won't
be affected.

Bug: 183604054
Test: Manually failed one test and saw following tests passing
Signed-off-by: Yan Yan <evitayan@google.com>
Change-Id: I82bb8796eac69f51e2f9416314e38c3203fc993e
1 file changed
tree: 119e3442d2c33c69fd67c7ebee337980c0897cd3
  1. devicetree/
  2. net/
  3. Android.bp
  4. METADATA