FsShell  forces creation of default filesystem object and incorrectly uses 
default filesystem in some places
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                 Key: HADOOP-5749
                 URL: https://issues.apache.org/jira/browse/HADOOP-5749
             Project: Hadoop Core
          Issue Type: Bug
          Components: fs
            Reporter: Joydeep Sen Sarma


i was trying do fs -ls operations on s3n filesystem uris (which was not 
configured as my default filesystem - the default filesystem was not bought 
up). these operations failed since they always tried to open the default 
filesystem (error: ""Bad connection to FS. command aborted."). but the default 
filesystem is not required in these cases at all.

the code also shows that the default filesystem is used in certain places 
(instead of the filesystem of the uri). for instance:

copy(String argv[], ...) { ...
       Path dst = new Path(dest);
       if (!fs.isDirectory(dst)) { 

there are some other places as well.

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