[FT] Method "_router_lifecycle" failing when checking if router is "primary"

[Rodolfo Alonso]

Some examples:
* https://7dbf986b2ac380cd13d6-397caf381a73cd99b004eb00bbac7fbc.ssl.cf2.rackcdn.com/825428/10/check/neutron-functional-with-uwsgi/1f91dc7/testr_results.html
* https://storage.bhs.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_780/828687/1/gate/neutron-functional-with-uwsgi/780a196/testr_results.html
* https://56478ba267ebf25a23bb-1eea024bd5e7ce21ccc269ced577bdd4.ssl.cf2.rackcdn.com/830509/3/gate/neutron-functional-with-uwsgi/efe0312/testr_results.html

Example snippet: https://paste.opendev.org/show/b6R7hTMJoaB1LNB0df3w/

[Rodolfo Alonso (rodolfo-alonso-hernandez)]

More occurrences:
* https://2f507ad644729ed0a17c-1abd4c4163ab8d95786215227f5e857f.ssl.cf5.rackcdn.com/periodic/opendev.org/openstack/neutron/master/neutron-functional/b2b1e2c/testr_results.html
* https://33989e35e43da1db0b96-a619ea89024f9935a8230ca8f397a8a1.ssl.cf2.rackcdn.com/periodic/opendev.org/openstack/neutron/master/neutron-functional/e5ce944/testr_results.html