Add unsed metron agents to router/dea agent/cloud controller

Metron agent should be deployed to all instances that emit logs to
loggregator, but turned off by default. We can change the
metron_endpoint property from a loggregator trafficcontroller IP address
to 127.0.0.1 to use metron.

Signed-off-by: John Tuley <jtuley@pivotallabs.com>