dropsonde.Initialize now takes an array for origin

[#78384372]

Signed-off-by: Joseph Rodriguez <jrodriguez@pivotal.io>
bump loggregatorlib

c9192c7 Remove metrics from loggregator_client

automatic promotion by GoCD workflow Loggregatorlib/144 > UnitTests/1 > UnitTests
remove unused import

Signed-off-by: Joseph Rodriguez <jrodriguez@pivotal.io>