HADOOP-16547 review other tool commands and have them instantiate the FS if a path was provided and region calculation didn't force this in

I can't think of a good way to test this with a unit test, except maybe one involving delegation tokens

Change-Id: I914f2c2b4d3691c5b7c5bdbb98b84ce2dcc3cba0

Author: steveloughran

hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/s3guard/S3GuardTool.java

@@ -616,6 +616,7 @@ public int run(String[] args, PrintStream out) throws Exception {
       // Validate parameters.
       try {
         parseDynamoDBRegion(paths);
+        maybeInitFilesystem(paths);
       } catch (ExitUtil.ExitException e) {
         errorln(USAGE);
         throw e;
@@ -668,6 +669,7 @@ public int run(String[] args, PrintStream out) throws Exception {
         checkBucketNameOrDDBTableNameProvided(paths);
         checkIfS3BucketIsGuarded(paths);
         parseDynamoDBRegion(paths);
+        maybeInitFilesystem(paths);
       } catch (ExitUtil.ExitException e) {
         errorln(USAGE);
         throw e;