Add rm to CLI

[Kimahriman]

-rm [-f] [-r|-R] [-skipTrash] [-safely] <src> ... :
  Delete all files that match the specified file pattern. Equivalent to the Unix
  command "rm <src>"
                                                                                 
  -f          If the file does not exist, do not display a diagnostic message or 
              modify the exit status to reflect an error.                        
  -[rR]       Recursively deletes directories.                                   
  -skipTrash  option bypasses trash, if enabled, and immediately deletes <src>.  
  -safely     option requires safety confirmation, if enabled, requires          
              confirmation before deleting large directory with more than        
              <hadoop.shell.delete.limit.num.files> files. Delay is expected when
              walking over large directory recursively to count the number of    
              files to be deleted before the confirmation.