Increase main_test timeout.
Increase main_test timeout.

- travis needs more time.

[#91161536]

cloudfoundry-incubator/route-registrar,siddhuwarrier/route-registrar,siddhuwarrier/route-registrar,MatthiasWinzeler/route-registrar,MatthiasWinzeler/route-registrar,cloudfoundry-incubator/route-registrar