core tests fails to run on Fedora 19

[Jeff Johnson]

On Fedora 19 it is not possible to run core test because the PAM backdoor is
not properly installed:

[14:38:30] Installing the PAM vsx0-to-root backdoor (will be removed at end)
[14:38:30] %> cp -f /etc/pam.d/su /etc/pam.d/su.orig0
[14:38:30] Run core tests v. 4.1.13-2
[14:38:30] % open2( /opt/lsb/test/manager/utils/../ptyshell/ptyshell --pidfile
/tmp/dist-checker/PTYSUB_PID -u vsx0 )
<14:38:31>
<14:38:31> To execute the LSB test suites run "run_tests"
<14:38:31>
<14:38:31> bash-4.2$ export LC_ALL=C; export LC_MESSAGES=C; export
LC_COLLATE=C; export LC_CTYPE=C; export LC_MONETARY=C; export LC_NUMERIC=C;
export LC_TIME=C;
<14:38:32> bash-4.2$ cd '/home/tet/test_sets'
<14:38:33> bash-4.2$ . ./.profile >/dev/null
<14:38:34> bash-4.2$ ./run_tests; exit
<14:38:35> Enter the root password:
<14:38:35> Password:
[14:39:35] No output from subshell for 01 minutes, 00 seconds
[14:40:35] No output from subshell for 02 minutes, 00 seconds
[14:41:35] No output from subshell for 03 minutes, 00 seconds
[14:42:35] No output from subshell for 04 minutes, 00 seconds
[14:43:35] No output from subshell for 05 minutes, 00 seconds
[14:44:35] No output from subshell for 06 minutes, 00 seconds
[14:45:35] No output from subshell for 07 minutes, 00 seconds
[14:46:35] No output from subshell for 08 minutes, 00 seconds
[14:47:35] No output from subshell for 09 minutes, 00 seconds
[14:48:35] No output from subshell for 10 minutes, 00 seconds
[14:48:37] Time for questions is over.
[14:48:37] Waiting for logout...
[14:48:38] Subshell closed with exit code 127.
[14:48:38] !!! ERROR:
[14:48:38] core test has crashed.