Revert "Outbound traffic controller streams messages from each LS"

This reverts commit d41aa52dae04f3456dc1fb558876f9a62a603b9f.

Conflicts:
	src/trafficcontroller/outputproxy/output_proxy_single_hasher_test.go
automatic promotion by GoCD workflow LoggregatorIntegrationTest/92 > IntegrationTests/1 > IntegrationTests

tests passed against https://github.com/cloudfoundry/cf-release/commit/4c9c6d0a6d9fdb7944ddaf6b9528e53fc152df6d