* Implementation of "chunked framing" according to RFC6242 for Netconf 1.1.

* First hello is 1.0 EOM framing, then successing rpc is chunked framing
  * See
    * [Netconf framing](https://github.com/clicon/clixon/issues/50), and
    * [Clixon does not switch to chunked framing after NETCONF 1.1 is negotiated](https://github.com/clicon/clixon/issues/314)
* C:
  * Moved netconf framing code from netconf application to clixon lib
* Test:
  * New expecteof_netconf and adjusted other expect scripts to handle NETCONF 1.1 framing

test/test_perf_mem.sh

@@ -91,7 +91,8 @@ function testrun(){
     pid=$(cat $pidfile)
 
     new "netconf get stats"
-    res=$(echo "$DEFAULTHELLO<rpc $DEFAULTNS><stats $LIBNS/></rpc>]]>]]>" | $clixon_netconf -qf $cfg)
+    rpc=$(chunked_framing "<rpc $DEFAULTNS><stats $LIBNS/></rpc>")
+    res=$(echo "$DEFAULTHELLO$rpc" | $clixon_netconf -qef $cfg)
 #    echo "res:$res"
     err0=$(echo "$res" | $clixon_util_xpath -p "/rpc-reply/rpc-error")
     err=${err0#"nodeset:"}