Add Bird dynamic routing daemin monitoring plugin

plugins/bird/README

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+NAME
+    bird - Munin multigraph plugin to monitor BIRD routing daemon activity
+
+APPLICABLE SYSTEMS
+    Every system with running bird
+
+CONFIGURATION
+    The plugin must run with a user or group that could connect to bird
+    control socket.
+
+    This configuration snipplet is an example with the defaults:
+
+      [bird]
+        user root
+        protocols BGP
+        socket /var/run/bird.ctl
+
+USAGE
+    Link this plugin to /etc/munin/plugins/ and restart the munin-node.
+
+MAGIC MARKERS
+      #%# family=auto
+      #%# capabilities=autoconf
+
+BUGS
+    Not known
+
+AUTHOR
+    Luben Karavelov (karavelov at mail.bg)
+
+LICENSE
+    Same as perl
+