Use RainerScript ``if'' statements and ``action()'' directives for
saving of client logs instead of the traditional facility.severity
selectors.  There are a couple of reasons for this:

 - We can use program name, not just syslog facility, to select
   which messages should go to the audit logs.  Non-audit local6
   messages will not be misplaced.
 - We can use the more readable ``stop'' directive instead of the
   tilde ("~").
 - We want to be able to provide more parameters to at least some
   actions than the traditional selector rules can do, unless you
   use deprecated $ directives.  (This will be done in a later
   commit.)

The rules for local logs (the ones coming from the log server itself
and stored in /var/log) are left as traditional selectors, because
A) they are simple rules, and easier to read that way, and B) that's
the way they are written in the standard RHEL-7 /etc/rsyslog.conf
file where we copied them from.