Added three configuration properties to SyslogAppender: facility, stack.trace.pattern, and throwable.excluded. These provide more flexibility for segregation of log output for different audiences and systems, such as for creating audit-only logs, structured logs, and logs intended for debugging application errors.
Made facility config propertyPrivate; Removed bit of documentation from metatype description
Merge branch 'feature/syslog-appender-additional-config-properties' of github.com:adamcin/acs-aem-commons into adamcin-feature/syslog-appender-additional-config-properties
formatting