ldb_debug tests: Fix binary data in debug log

ldb_debug tests: Fix binary data in debug log

Tests to ensure:
    When duplicate objects are added, the GUID was printed in the debug log
    are passed through the escape function.
    And that duplicate DN's do not generate debug log entries.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13185

Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Mon Feb 26 07:29:49 CET 2018 on sn-devel-144