Bug #468, http://bugs.skysql.com/show_bug.cgi?id=468, Query classifier accessed freed thread context. If parsing fails thd doesn't need to be freed because it holds correct information about command type.

session.c:session_setup_filters : fixed memory leak
hintparser.c: added token_free for HINT_TOKENs and fixed a few memory leaks.
mysql_client_server_protocol.h: added mysql_protocol_done which frees memory blocks pointed to by protocol members. Those can't be freed in dcb.c because dcb.c doesn't know about protocol's members.
mysql_backend.c:gw_backend_close: fixed memory leak
mysql_client.c: gw_client_close: fixed memory leak
mysql_common.c: added implementation of mysql_protocol_done
        :protocol_archive_srv_command: tried to fix memory leak. Some memory is still leaking according to valgrind. Removed use of uninitialized local variable len.
readwritesplit.c: Fix to bug #469, http://bugs.skysql.com/show_bug.cgi?id=469,  rwsplit counts every connection twice in master - counnection counts leak
	execute_sescmd_in_backend: fixed a memory leak - visible only in DEBUG=Y build.
readwritesplit/test/makefile: added target for hints tests

server/modules/routing/readwritesplit/test/test_hints/rwsplit_hints.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+NARGS=6
+TLOG=$1
+THOST=$2
+TPORT=$3
+TMASTER_ID=$4
+TUSER=$5
+TPWD=$6
+
+if [ $# != $NARGS ] ;
+then
+echo""
+echo "Wrong number of arguments, gave "$#" but "$NARGS" is required"
+echo "" 
+echo "Usage :" 
+echo "        rwsplit.sh <log filename> <host> <port> <master id> <user> <password>"
+echo ""
+exit 1
+fi
+
+TESTINPUT=hints.txt
+QUERY="select @@server_id;"
+RUNCMD=mysql\ --host=$THOST\ -P$TPORT\ -u$TUSER\ -p$TPWD\ --unbuffered=true\ --disable-reconnect\ --silent\
+
+while read -r LINE
+do
+TINPUT=`echo "$LINE"|awk '{split($0,a,":");print a[1]}'`
+TRETVAL=`echo "$LINE"|awk '{split($0,a,":");print a[2]}'`
+a=`$RUNCMD -e"$QUERY$TINPUT"`
+if [ "$a" != "$TRETVAL" ]; then 
+        echo "$TINPUT FAILED, return value $a when $TRETVAL was expected">>$TLOG; 
+else 
+        echo "$TINPUT PASSED">>$TLOG ; 
+fi
+
+done < $TESTINPUT