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
rename dropsonde proxy to doppler proxy

[#76285060]

Signed-off-by: Johannes Petzold <jpetzold@pivotal.io>
minor test refactor

Signed-off-by: Johannes Petzold <jpetzold@pivotal.io>
fix port conflict in integration test config

[#76285060]

Signed-off-by: Johannes Petzold <jpetzold@pivotal.io>