Move trafficcontroller/trafficontroller up; ginkgo-ify its tests [#74964290]

Signed-off-by: Johannes Tuchscherer <jtuchscherer@pivotallabs.com>

Signed-off-by: Johannes Tuchscherer <jtuchscherer@pivotallabs.com>
Add GOROOT to .envrc

Signed-off-by: Johannes Tuchscherer <jtuchscherer@pivotallabs.com>
Emitting a heartbeat to etcd [#74964290]

Signed-off-by: Johannes Tuchscherer <jtuchscherer@pivotallabs.com>
automatic promotion by GoCD workflow LoggregatorIntegrationTest/64 > IntegrationTests/1 > IntegrationTests

tests passed against https://github.com/cloudfoundry/cf-release/commit/15e8bbb7950d840994203076750aabf2a706956a