Fix E402 (module level import not at top of file) pep8 errors
and no longer ignore new failures.
Trivialfix
Change-Id: If9a202f1f322b5b03966c692e33e94b7c872079b
Currently HA router interface port uses DEVICE_OWNER_ROUTER_INTF as
device owner(like normal router interface). So to check if a port is
a HA router interface port, we have to perform a DB operation.
Neutron server at many places may need check if a port is HA router
interface port and perform different set of operations, then it has
to access DB for this. Instead of that, if this information is
available as port's device owner, we can avoid DB access every time.
Closes-bug: #1554519
Change-Id: I322c392529c04aca2448fd957a35f4908b323449
Rodolfo Alonso Hernandez