go fmt

Signed-off-by: Johannes Petzold <jpetzold@pivotallabs.com>
[#67664082] Use instrumented emitter wrapper as default.

Keeping count of received, sent metrics and errors.

Signed-off-by: Johannes Petzold <jpetzold@pivotallabs.com>
Signed-off-by: Johannes Tuchscherer <jtuchscherer@pivotallabs.com>
[#67664082] Refactoing to pass in the origin information

No longer read origin information from environment variables when
emitting.

Signed-off-by: Johannes Tuchscherer <jtuchscherer@pivotallabs.com>
[#67664082] Making sure that you need a udp
emitter for your instrumented emitter

Signed-off-by: Johannes Tuchscherer <jtuchscherer@pivotallabs.com>