Disable maxScan tests when server version >= 4.1

MongoDB 4.2 will remove support for the maxScan option to the find
command, so the driver's integration tests of maxScan must be ignored
when the server version is 4.1 or higher.

Author: jyemin

driver-core/src/test/functional/com/mongodb/operation/FindOperationSpecification.groovy

@@ -389,6 +389,7 @@ class FindOperationSpecification extends OperationFunctionalSpecification {
         async << [true, false]
     }
 
+    @IgnoreIf({ serverVersionAtLeast(4, 1) })
     def '$maxScan should limit items returned'() {
         given:
         (1..100).each {

driver-legacy/src/test/functional/com/mongodb/DBCursorTest.java

@@ -39,6 +39,7 @@
 import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
+import static org.junit.Assume.assumeFalse;
 import static org.junit.Assume.assumeThat;
 import static org.junit.Assume.assumeTrue;
 
@@ -311,6 +312,7 @@ public void testConstructor() {
     @Test
     @SuppressWarnings("deprecation")
     public void testMaxScan() {
+        assumeFalse(serverVersionAtLeast(4, 1));
         countResults(new DBCursor(collection, new BasicDBObject(), new BasicDBObject(), ReadPreference.primary())
                      .addSpecial("$maxScan", 4), 4);
         countResults(new DBCursor(collection, new BasicDBObject(), new BasicDBObject(), ReadPreference.primary()).maxScan(4), 4);