Get rid of  java.sql.SQLException: Already have 1 record(s) with pnfsPath=.... for good

commit 635a05a78debe247c717b6fd27c18067af676ccb
Author: Dmitry Litvintsev <litvinse@fnal.gov>
Date:   Fri Jun 21 15:18:27 2013 -0500

    spacemanager: Get rid of java.sql.SQLException: Already have 1 record(s) with pnfsPath=.... for good

    what happened

    Ticket: 7888
    Acked-by: Al Rossi
    Target: trunk
    Request: 2.6
    Request: 2.2
    Require-book: no
    Require-notes: no
(cherry picked from commit c9fcd4d1779cf2573328c66804df3e9458d25c74)