Asterisk admin must be able to run 'asterisk -r'
    
    One of the most frequently ran commands by asterisk administrators is to
    run 'asterisk -r' to manipulate (through the asterisk socket) the
    asterisk daemon (sort-of asterisk-specific shell support).
    
    We mark the asterisk_exec_t type as an application_exec_type so that it
    can be executed by the user domains.
    
    Signed-off-by: Sven Vermeulen <sven.vermeulen@siphos.be>