Multiple fixes and enhancements
    
    pam_namespace: Support noexec, nosuid and nodev flags for tmpfs mounts
    Drop tallylog and pam_tally documentation
    pam_faillock: Support local_users_only option
    pam_lastlog: Do not display failed attempts with PAM_SILENT flag
    pam_lastlog: Support unlimited option to override fsize limit
    pam_unix: Log if user authenticated without password
    pam_tty_audit: Improve manual page
    Optimize closing fds when spawning helpers
    Fix duplicate password verification in pam_authtok_verify()