Bump src/loggregator

Bump
  cf-loggregator:
     Creating final release
     bump dropsonde
  Jeremy Alvis:
     Merge commit '160129cc17f1e9f1b21ca6311b0495370afe306d'
     Move windows go blob to golang dir
     Checks nil pointer in log counter tests
     Fixes data race in logcounter tests
     Adds the ability to configure the number of log counters
     Merge latest changes with load testing work
     Updates memory allocated to logcounterapp to be 4G
     Load testing reports the number of connection errors seen by a consumer
     Have metronSetup return a func to wait for it to be ready
  Warren Fernandes:
     Fixes a flaky test in dump sink
     Fixes UDP listener tests
     Stop asserting on benchmarks and clean up end to end tests
     Support dynamic IPs in Loggregagtor
     Removes appveyor build config
     Updates metron_agent_windows spec and templates
     Remove dead helpers package
  Sam Nelson:
     Update doppler finder to compare legacy updates
     Fix flaky TB test
     Use a set for comparing doppler events
     Add bosh links to metron_agent_windows and fix depricated property name
  Jason Keene:
     Fixes data race in syslog sink (hopefully)
     Sets missing environment variables for logcounter
     Add golang windows blob
     Merge commit '1b999b8a'
     Copy batcher locally to ensure there is no sharing between tests
     Merge branch 'chore/investigate-flaky-tests-126824847' into develop
     Remove binary that was commited
     Add better color handling for ginkgo writers
     Merge pull request #142 from cloudfoundry/pivotal-cf-metron-windows-job
     Make UDP listener emit log that is the same as TLS/TCP
     Make fixtures match helpers
     Add colors to ginkgo writers
     Add binaries package and helpers to integration_tests
  Nino Khodabandeh:
     Retries if websocketSever listening fails
     Fix flaky batch writer test on Windows
     Generates configuration file for boshhmforwarder integration tests to create a random info port
  CF Loggregator CI Pipeline:
     Merge final release artifacts
  Your Name:
     Merge branch 'metron-windows-job' of https://github.com/pivotal-cf/loggregator into pivotal-cf-metron-windows-job
  Ben Moss:
     Add metron_agent_windows job

Signed-off-by: Jeremy Alvis <jalvis@pivotal.io>