Forward messages to loggregator from metron agent

[#74960262]

Signed-off-by: Johannes Petzold <jpetzold@pivotallabs.com>
automatic promotion by GoCD workflow LoggregatorIntegrationTest/62 > IntegrationTests/1 > IntegrationTests

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