implement firehose endpoint in doppler

[#74967392]

Signed-off-by: Johannes Petzold <jpetzold@pivotal.io>
Backporting syslog drain fix to Doppler

[#78382678]

Signed-off-by: Trevor Ackerman <tackerman@pivotal.io>
connect traffic controller to doppler

[#75365570]

Signed-off-by: John Tuley <jtuley@pivotal.io>
metron message_aggregator: use stop event's app id

Real-world start events from router do not include application id, but stop
events do.

[Fix #78500164]

Signed-off-by: John Tuley <jtuley@pivotal.io>
cleanup doppler websocket_server

Signed-off-by: John Tuley <jtuley@pivotal.io>
Factor firehose websocket server away from app logs websocket server

[#75365570]

Signed-off-by: John Tuley <jtuley@pivotal.io>
expire varz metrics

[#78163196]

Signed-off-by: Johannes Petzold <jpetzold@pivotal.io>
Ensure doppler dump sinks only receive log messages

Also refactor syslog sink to use same whitelist set for futureproofing.

[#76285312]
Improve test code formatting
Do not allow DEA Logging agent to store syslog drains with empty URLs

[#77769486]

Signed-off-by: John Tuley <jtuley@pivotal.io>
bump loggregator_consumer

a35b406 Add sample dropsonde consumer

automatic promotion by GoCD workflow LoggregatorConsumer/98 > UnitTests/1 > UnitTests
bump loggregatorlib

a1c6a19 Fix issues running under go1.3.1

automatic promotion by GoCD workflow Loggregatorlib/121 > UnitTests/1 > UnitTests
Bump dropsonde

[#78672874]

Signed-off-by: John Tuley <jtuley@pivotal.io>
bump loggregatorlib

687c20c Install etcd from source on travis; run tests on go 1.2.1 and 1.3.1

automatic promotion by GoCD workflow Loggregatorlib/122 > UnitTests/1 > UnitTests
bump loggregatorlib

3067abd Grab the source code for etcd but not install it.

automatic promotion by GoCD workflow Loggregatorlib/123 > UnitTests/1 > UnitTests
switch over to new dropsonde format everywhere

- metron upconverts old format into dropsonde
- trafficcontroller downconverts into old format

[#76285060]

Signed-off-by: Trevor Ackerman <tackerman@pivotal.io>
bump loggregatorlib

2d516b3 Install etcd into gopath

automatic promotion by GoCD workflow Loggregatorlib/124 > UnitTests/1 > UnitTests
bump loggregatorlib

6cefbc1 Use explicit GOPATH
6687f1c Fix typo

automatic promotion by GoCD workflow Loggregatorlib/125 > UnitTests/1 > UnitTests
bump loggregatorlib

3ad2424 Correct some gopath issues

automatic promotion by GoCD workflow Loggregatorlib/126 > UnitTests/1 > UnitTests
bump loggregatorlib

3c4a0b0 Return to correct directory after installing etcd

automatic promotion by GoCD workflow Loggregatorlib/127 > UnitTests/1 > UnitTests