Bump version to 1.6.9-dev.

README

-This is radsecproxy 1.6.8 from 2016-09-21.
+This is unreleased radsecproxy 1.6.9-dev.
 
 radsecproxy is a generic RADIUS proxy that supports both UDP and TLS
 (RadSec) RADIUS transports.  There is also experimental support for

configure.ac

-AC_INIT(radsecproxy, 1.6.8, radsecproxy@lists.nordu.net)
+AC_INIT(radsecproxy, 1.6.9-dev, radsecproxy@lists.nordu.net)
 AC_CANONICAL_TARGET
 AM_INIT_AUTOMAKE
 AC_PROG_CC

radsecproxy.conf.5.xml

@@ -9,7 +9,7 @@
       <application>radsecproxy.conf</application>
     </refentrytitle>
     <manvolnum>5</manvolnum>
-    <refmiscinfo>radsecproxy 1.6.8</refmiscinfo>
+    <refmiscinfo>radsecproxy 1.6.9-dev</refmiscinfo>
   </refmeta>
   <refnamediv>
     <refname>