HDDS-3840. Use OFS in MapReduce acceptance test

[adoroszlai]

What changes were proposed in this pull request?

Run HDFS (hdfs dfs) and MapReduce (yarn jar) tests for both O3FS and OFS.

https://issues.apache.org/jira/browse/HDDS-3840

How was this patch tested?

Regular CI:
https://github.com/adoroszlai/hadoop-ozone/runs/1042638707

hadoopfs-o3fs :: Test ozone fs with hadoopfs                          | PASS |
mapreduce-o3fs :: Execute MR jobs                                     | PASS |
hadoopfs-ofs :: Test ozone fs with hadoopfs                           | PASS |
mapreduce-ofs :: Execute MR jobs                                      | PASS |

Running command 'yarn jar /opt/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.3.jar wordcount -D fs.defaultFS=ofs://om/volume1/bucket1 ofs://om/volume1/bucket1/input/ ofs://om/volume1/bucket1/wordcount-35.txt
...
Running command 'yarn jar /opt/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.3.jar wordcount -D fs.defaultFS=o3fs://bucket1.volume1.om/ o3fs://bucket1.volume1.om/input/ o3fs://bucket1.volume1.om/wordcount-91.txt

[smengcl]

Thanks @adoroszlai . lgtm +1.

[adoroszlai]

Thanks @smengcl for the review.