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/makefile

@@ -14,6 +14,7 @@ RET := -1
 cleantests:
 	- $(DEL) *.o 
 	- $(DEL) *~
+	-$(MAKE) -C test_hints cleantests
 
 
 testall: 
@@ -32,4 +33,5 @@ runtests:
 	@echo "-------------------------------"	>> $(TESTLOG)
 	./rwsplit.sh $(TESTLOG) $(THOST) $(TPORT_RW) $(TMASTER_ID) $(TUSER) $(TPWD) 
 	@echo ""                        >> $(TESTLOG)
-	@cat $(TESTLOG)			>> $(TEST_MAXSCALE_LOG)
+	@cat $(TESTLOG)			>> $(TEST_MAXSCALE_LOG)
+	-$(MAKE) -C test_hints runtests