Add in transitions for queue types when the queues are created
    
    At startup, postfix creates the missing queue directories inside
    /var/spool/postfix. This is done by the master process. However, since the
    /var/spool/postfix directory is labeled postfix_spool_t and there were no named
    file transitions, all created queues became postfix_spool_t. This meant that an
    administrator had to relabel the directories afterwards.
    
    This patch adds in the necessary named file transitions for those directories,
    create privileges for the master domain and setattr (to change directory
    ownership).
    
    Also add in the fowner capability for the master domain, needed for running
    chown on the queue's.
    
    Signed-off-by: Sven Vermeulen <sven.vermeulen@siphos.be>