GH-16468 - fix load_grid and loadGrid for S3 paths
          #16478
        
          
      
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h2o.load_gridandh2o.loadGrid#16468Please provide any constructive feedback. I have not written java before so this is a first attempt at a java contribution.
I believe S3 path instances of
Persistsimply needed atgetParentmethod, which I have tried to provide.It should do things like:
s3://bucket/path -> s3://bucket
s3://bucket/path/ -> s3://bucket
s3://bucket/path/more -> s3://bucket/path
s3://bucket -> error