docs: use JavaScript based PolicyKit .rules files

PolicyKit authentication rules have switched to a JavaScript based
format quite some time ago. See:

http://davidz25.blogspot.com/2012/06/authorization-rules-in-polkit.html

While backwards compat for the old .pkla format is still available, it
makes sense to point people first at the new format.

The SSHPolicyKitSetup wiki page seems pretty stale, so remove the
reference to it.
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>
Signed-off-by: NMark McLoughlin <markmc@redhat.com>

docs/auth.html.in

@@ -184,15 +184,29 @@ Default policy will still allow any application to connect to the RO socket.
 </p>
     <p>
 The default policy can be overridden by creating a new policy file in the
-local override directory <code>/etc/polkit-1/localauthority/50-local.d/</code>.
-Policy files should have a unique name ending with .pkla.  Using reverse DNS
-naming works well. Information on the options available can be found by
-reading the pklocalauthority man page. The two libvirt daemon actions
-available are named <code>org.libvirt.unix.manage</code> for full management
-access, and <code>org.libvirt.unix.monitor</code> for read-only access.
+<code>/etc/polkit-1/rules.d</code> directory. Information on the options
+available can be found by reading the <code>polkit(8)</code> man page. The
+two libvirt actions are named <code>org.libvirt.unix.manage</code> for full
+management access, and <code>org.libvirt.unix.monitor</code> for read-only
+access.
+</p>
+    <p>
+As an example, creating <code>/etc/polkit-1/rules.d/80-libvirt-manage.rules</code>
+with the following gives the user <code>fred</code> full management access
+when accessing from an active local session:
     </p>
+<pre>polkit.addRule(function(action, subject) {
+  if (action.id == "org.libvirt.unix.manage" &amp;&amp;
+      subject.local &amp;&amp; subject.active &amp;&amp; subject.user == "fred") {
+      return polkit.Result.YES;
+  }
+});</pre>
     <p>
-As an example, this gives the user <code>fred</code> full management access:
+Older versions of PolicyKit used policy files ending with .pkla in the
+local override directory <code>/etc/polkit-1/localauthority/50-local.d/</code>.
+Compatibility with this older format is provided by <a
+href="https://pagure.io/polkit-pkla-compat">polkit-pkla-compat</a>. As an
+example, this gives the user <code>fred</code> full management access:
     </p>
 <pre>[Allow fred libvirt management permissions]
 Identity=unix-user:fred
@@ -200,10 +214,6 @@ Action=org.libvirt.unix.manage
 ResultAny=yes
 ResultInactive=yes
 ResultActive=yes</pre>
-    <p>
-Further examples of PolicyKit setup can be found on the
-<a href="http://wiki.libvirt.org/page/SSHPolicyKitSetup">wiki page</a>.
-    </p>
     <h2><a id="ACL_server_sasl">SASL pluggable authentication</a></h2>
 
     <p>