pam_ssh: restore credentials before exiting from pam sm open session

This update fixes the following issue with pam_ssh:
- bnc#823484: restore credentials before exiting from pam sm open session

Fixed bugs
bnc#823484
pam_ssh stays as user if no session tty
bnc#727246
ssh-agent blocks SIGTERM when started via kdm and pam_ssh
Selected Binaries
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