Fix couchbase flaky test (cleanup phase)

Mute tracing on cleanup, instead of waiting for a cleanup span. This
test is flaky when it does not receive the cleanup span in time (under
heavy load).

Also, do not shallow exceptions on cleanup. If we ever get them, we can
address them, or add a more specific catch.

dd-java-agent/instrumentation/couchbase/couchbase-2.0/src/test/groovy/util/AbstractCouchbaseTest.groovy

@@ -114,25 +114,17 @@ abstract class AbstractCouchbaseTest extends VersionedNamingTestBase {
   }
 
   protected void cleanupCluster(CouchbaseAsyncCluster cluster, CouchbaseEnvironment environment) {
-    def cleanupSpan = runUnderTrace("cleanup") {
-      try {
-        cluster?.disconnect()?.timeout(10, TimeUnit.SECONDS)?.toBlocking()?.single()
-        environment.shutdown()
-      } catch (Throwable ex) {
-        // ignore
-      }
-      activeSpan()
+    try (def suppressScope = TEST_TRACER.muteTracing()) {
+      cluster?.disconnect()?.timeout(10, TimeUnit.SECONDS)?.toBlocking()?.single()
+      environment.shutdown()
     }
-    TEST_WRITER.waitUntilReported(cleanupSpan as DDSpan, 60, TimeUnit.SECONDS)
   }
 
   protected void cleanupCluster(CouchbaseCluster cluster, CouchbaseEnvironment environment) {
-    def cleanupSpan = runUnderTrace("cleanup") {
+    try (def suppressScope = TEST_TRACER.muteTracing()) {
       cluster?.disconnect()
       environment.shutdown()
-      activeSpan()
     }
-    TEST_WRITER.waitUntilReported(cleanupSpan as DDSpan)
   }
 
   void assertCouchbaseCall(TraceAssert trace, String name, String bucketName = null, Object parentSpan = null) {