Remove unused imports from test
MODIFY
dd-trace-ot/src/test/groovy/datadog/trace/DDTracerTest.groovy
dd-trace-ot/src/test/groovy/datadog/trace/DDTracerTest.groovy
package datadog.trace
-import datadog.opentracing.DDSpan
import datadog.opentracing.DDTracer
import datadog.opentracing.propagation.HttpCodec
import datadog.trace.api.Config
-import datadog.trace.api.DDTags
import datadog.trace.common.sampling.AllSampler
import datadog.trace.common.sampling.RateByServiceSampler
import datadog.trace.common.writer.DDAgentWriter

Remove unused imports from test