SetGetSendBufferSize failed on mac machine with jdk 11

**Describe the bug**
SetGetSendBufferSize failed on mac machine with jdk 11 for both hotspot and openj9.

**To Reproduce**
Steps to reproduce the behavior (or Grinder rerun link): https://ci.adoptopenjdk.net/view/Test_grinder/job/Grinder/6461/testReport/java_net_DatagramSocket_SetGetSendBufferSize/java/SetGetSendBufferSize/

**Additional context**
```
10:24:54 java/net/DatagramSocket/SetGetSendBufferSize.java
10:24:54
10:24:54 test SetGetSendBufferSize.testInitialSendBufferSize("DatagramSocket", SetGetSendBufferSize$$Lambda$67/0x0000000000000000@40be6667): success
10:24:54 test SetGetSendBufferSize.testInitialSendBufferSize("MulticastSocket", SetGetSendBufferSize$$Lambda$68/0x0000000000000000@41fa47e5): success
10:24:54 test SetGetSendBufferSize.testInitialSendBufferSize("DatagramSocketAdaptor", SetGetSendBufferSize$$Lambda$69/0x0000000000000000@2b8be523): failure
10:24:54 java.lang.AssertionError: DatagramSocketAdaptor expected [true] but found [false]
10:24:54 at org.testng.Assert.fail(Assert.java:94)
10:24:54 at org.testng.Assert.failNotEquals(Assert.java:496)
10:24:54 at org.testng.Assert.assertTrue(Assert.java:42)
10:24:54 at SetGetSendBufferSize.testInitialSendBufferSize(SetGetSendBufferSize.java:95)
10:24:54 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
10:24:54 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
10:24:54 at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
10:24:54 at java.base/java.lang.reflect.Method.invoke(Method.java:566)
10:24:54 at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
10:24:54 at org.testng.internal.Invoker.invokeMethod(Invoker.java:639)
10:24:54 at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:821)
10:24:54 at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1131)
10:24:54 at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
10:24:54 at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
10:24:54 at org.testng.TestRunner.privateRun(TestRunner.java:773)
10:24:54 at org.testng.TestRunner.run(TestRunner.java:623)
10:24:54 at org.testng.SuiteRunner.runTest(SuiteRunner.java:357)
10:24:54 at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:352)
10:24:54 at org.testng.SuiteRunner.privateRun(SuiteRunner.java:310)
10:24:54 at org.testng.SuiteRunner.run(SuiteRunner.java:259)
10:24:54 at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
10:24:54 at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
10:24:54 at org.testng.TestNG.runSuitesSequentially(TestNG.java:1185)
10:24:54 at org.testng.TestNG.runSuitesLocally(TestNG.java:1110)
10:24:54 at org.testng.TestNG.run(TestNG.java:1018)
10:24:54 at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:94)
10:24:54 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
10:24:54 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
10:24:54 at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
10:24:54 at java.base/java.lang.reflect.Method.invoke(Method.java:566)
10:24:54 at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:312)
10:24:54 at java.base/java.lang.Thread.run(Thread.java:836)
```

Start with SetGetSendBufferSize.java and the failure at line 95, then reproduce the linked Grinder report on macOS with JDK 11 for DatagramSocketAdaptor. Compare the adaptor result with the successful DatagramSocket and MulticastSocket cases; done means the test has a justified, passing behavior on the affected environments.

Written by the indexing model from the issue text.