make loggregator.servers overridable by stubs

[#75468276]

Signed-off-by: Johannes Petzold <jpetzold@pivotallabs.com>
Merge remote-tracking branch 'origin/develop' into lamb-develop
Merge remote-tracking branch 'origin/develop' into lamb-develop
Merge remote-tracking branch 'origin/develop' into lamb-develop
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>
Merge remote-tracking branch 'origin/develop' into lamb-develop
bump loggregator

13897b8 remove empty line from README

automatic promotion by GoCD workflow / > / >
Merge remote-tracking branch 'origin/develop' into lamb-develop
bump loggregator

07e0518 Fix BUG in README

automatic promotion by GoCD workflow LoggregatorUnitTests/5 > UnitTests/1 > UnitTests
automatic promotion by GoCD workflow LoggregatorIntegrationTest/119 > IntegrationTests/1 > IntegrationTests

tests passed against https://github.com/cloudfoundry/cf-release/commit/34091d0695e7e60b777783150032e0ce1be9d568
bump loggregator

60f4afd automatic promotion by GoCD workflow LoggregatorIntegrationTest/119 > IntegrationTests/1 > IntegrationTests
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b2ff0cb merge from develop
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d6fdb6a Update README.md

automatic promotion by GoCD workflow LoggregatorUnitTests/6 > UnitTests/1 > UnitTests
automatic promotion by GoCD workflow LoggregatorIntegrationTest/122 > IntegrationTests/1 > IntegrationTests

tests passed against https://github.com/cloudfoundry/cf-release/commit/b4798de737b5c1e3b3a0403ec95f810ca2ac0def