gracefully handle bad config/policy files, drop polkit-reload-config, syslog

gracefully handle bad config/policy files, drop polkit-reload-config, syslog

 - don't abort/malfunction if the /etc/PolicyKit/PolicyKit.conf
   configuration file is malformed; simply just continue as normal
   but return 'no' to every question asked. Also use syslog(3) to
   report this to the system log

 - if a .policy file is malformed, simply skip it and still include
   other well-formed .policy files. Use syslog(3) to report if indeed
   a .policy file is malformed.

 - drop /var/lib/PolicyKit/reload and rely on inotify to detect changes to
   - /etc/PolicyKit/PolicyKit.conf
   - Policy files in /usr/share/PolicyKit/policy
   - privileges in /var/lib/PolicyKit and /var/run/PolicyKit

As a result, changes made to /etc/PolicyKit/PolicyKit.conf (typically
an admin edits this file) and .policy files (typically these can
change on package upgrades) in /usr/share/PolicyKit/policy are
instantly picked up.