kes Ensure that when labelling a tape with Slot=0 that InChanger

     is not set.
kes  Use DISTINCT to make MySQL and PostgreSQL uar_list_temp query
     the same.
kes  Add StartTime to final uar_sel_jobid_temp query so that we can
     add DISTINCT (required by PostgreSQL).
kes  Implement BSOCK authenticate_director() method. Eventually will
     authenicate all daemons.
kes  Move several more functions into the BSOCK class.