Ticket 47568 - Rename DSAdmin class
    
    Bug Description:
    	This bug is to rename DSAdmin main class with an other name: DirSrv
    	This change impact the lib389 as well as the tests.
    
    Fix Description:
            - Rename
                    directory: 'dsadmin' -> 'lib389'
                    class    : 'DSAdmin' -> 'DirSrv'
                    object   : 'dsadmin' -> 'dirsrv'
            - Add Index class, with method to delete indexes of a backend
              (for backend deletion)
            - Add 'delete' method in class backend
            - To run as regular user (/usr/bin/sudo, select ports > 1024)
            - Replace addbackend_harn per add backend+suffix
    	- Fix various unit tests (almost all of them are pass)
    	- Use local variable naming convention: camel_case
    
    https://fedorahosted.org/389/ticket/47568
    
    Reviewed by: Rich Megginson, Roberto (thanks you both for the review)
    
    Platforms tested: F17
    
    Flag Day: no
    
    Doc impact: no