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>