pam security, bug fix, and enhancement update

Removed default realtime limits, added and improved translations, adjusted default limits for realtime users, added support for limits.d, added auditing of failed logins, expanded /home/ksharma, added default limits for users in realtime group, prevented audit log injection through user name, made unix_update helper executable only by root, better documented behavior of pam_namespace, split out passwd change to a new helper binary, improved context change auditing, always decremented use count in pam_console, fixed parsing config file with unknown users, unmounted poly dir for override users, used raw context for poly dir name, truncated long poly dir name, correctly relabeled tty