HADOOP-15626. FileContextMainOperationsBaseTest.testBuilderCreateAppendExistingFile fails on filesystems without append.

Contributed by Steve Loughran.

hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/fileContext/ITestS3AFileContextMainOperations.java

@@ -51,6 +51,12 @@ public class ITestS3AFileContextMainOperations
     //append not supported, so test removed
   }
 
+  @Test
+  @Ignore
+  public void testBuilderCreateAppendExistingFile() throws IOException {
+    // not supported
+  }
+
   @Test
   @Ignore
   public void testSetVerifyChecksum() throws IOException {