Fix KMS TLS reactive test on JDK 8

JAVA-4374

Author: jyemin

.evergreen/run-tests.sh

@@ -144,5 +144,5 @@ else
               -Dorg.mongodb.test.gcpEmail=${GCP_EMAIL} -Dorg.mongodb.test.gcpPrivateKey=${GCP_PRIVATE_KEY} \
               ${MULTI_MONGOS_URI_SYSTEM_PROPERTY} ${API_VERSION} ${GRADLE_EXTRA_VARS} ${ASYNC_TYPE} \
               ${JAVA_SYSPROP_NETTY_SSL_PROVIDER} \
-              --stacktrace --info --continue test
+              --stacktrace --info --continue driver-reactive-stream:test
 fi

driver-sync/src/test/functional/com/mongodb/client/AbstractClientSideEncryptionKmsTlsTest.java

@@ -137,11 +137,18 @@ public void testThatCustomSslContextIsUsed() {
                 }})
                 .build();
         try (ClientEncryption clientEncryption = getClientEncryption(clientEncryptionSettings)) {
+            outer:
             for (String curProvider: kmsProviders.keySet()) {
-                MongoClientException e = assertThrows(MongoClientException.class, () ->
+                Throwable e = assertThrows(MongoClientException.class, () ->
                         clientEncryption.createDataKey(curProvider, new DataKeyOptions().masterKey(
                                 BsonDocument.parse(getMasterKey(curProvider)))));
-                assertTrue(e.getMessage().contains("Don't trust anything"));
+                while (e != null) {
+                    if (e.getMessage().contains("Don't trust anything")) {
+                        break outer;
+                    }
+                    e = e.getCause();
+                }
+                fail("No exception in the cause chain contains the expected string");
             }
         }
     }