ddtrace/tracer: Support DD_DOGSTATSD_HOST env var (#3084) #1472

Job	Run time
unit-integration-tests (1.22) / copyright	5s
unit-integration-tests (1.22) / lint	44s
unit-integration-tests (1.22) / test-contrib	5m 42s
unit-integration-tests (1.22) / test-core	4m 24s
unit-integration-tests (1.23) / copyright	9s
unit-integration-tests (1.23) / test-contrib	5m 14s
unit-integration-tests (1.23) / lint	3m 11s
unit-integration-tests (1.23) / test-core	4m 16s
multios-unit-tests (macos-latest, 1.22) / test-multi-os	4m 25s
multios-unit-tests (macos-latest, 1.23) / test-multi-os	5m 36s
multios-unit-tests (ubuntu-latest, 1.22) / test-multi-os	7m 20s
multios-unit-tests (ubuntu-latest, 1.23) / test-multi-os	3m 46s
multios-unit-tests (windows-latest, 1.22) / test-multi-os	11m 20s
multios-unit-tests (windows-latest, 1.23) / test-multi-os	10m 33s
	1h 6m 45s

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