Xu Cheng 
		d3fce64efb 
		
			
		
	 
	
	
	cleanup: fix removing lock files on NFS ... 
			If the underneath file system is a Network File System,
`brew cleanup` will fail to remove the lock files with following error
message:
Error: Bad file descriptor @ rb_file_flock - /path/to/the/lock_file
This commit fixes such issue and adds the corresponding test case. 
		
	 
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