null check to skip the test and remove non-aws region probe

Author: shameersss1

hadoop-tools/hadoop-aws/src/site/markdown/tools/hadoop-aws/third_party_stores.md

@@ -82,7 +82,7 @@ then these must be set, either in XML or (preferred) in a JCEKS file.
 
   <property>
     <name>fs.s3a.endpoint.region</name>
-    <value>non-aws</value>
+    <value>anything</value>
   </property>
 
   <property>

hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/ITestS3AEndpointRegion.java

@@ -518,12 +518,12 @@ public void testCentralEndpointAndNullRegionFipsWithCRUD() throws Throwable {
   }
 
   /**
-   * Skip the test if the region is sa-east-1.
+   * Skip the test if the region is null or sa-east-1.
    */
   private void skipCrossRegionTest() throws IOException {
     String region = getFileSystem().getS3AInternals().getBucketMetadata().bucketRegion();
-    if (SA_EAST_1.equals(region) || NON_AWS_REGION.equals(region)) {
-      skip("Skipping test since sa-east-1 or non-aws region is in use");
+    if (region == null || SA_EAST_1.equals(region)) {
+      skip("Skipping test since region is null or it is set to sa-east-1");
     }
   }
 

hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/S3ATestConstants.java

@@ -276,11 +276,6 @@ public interface S3ATestConstants {
    */
   String EU_WEST_1 = "eu-west-1";
 
-  /**
-   * Region name for testing S3A third party stores: {@value}.
-   */
-  String NON_AWS_REGION = "non-aws";
-
   /**
    * System property for root tests being enabled: {@value}.
    */