system_tests_edge_router stalls on Travis CI

55: test_50_link_topology (system_tests_edge_router.LinkRouteProxyTest) ... ok
No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#build-times-out-because-no-output-was-received
The build has been terminated