BUG/MINOR: lua: Abort when txn:done() is called from a Lua action

When a lua action aborts a transaction calling txn:done() function, the action
must return ACT_RET_ABRT instead of ACT_RET_DONE. It is mandatory to
abort the message analysis.

This patch must be backported everywhere the commit 7716cdf45 ("MINOR: lua: Get
the action return code on the stack when an action finishes") was
backported. For now, no backport needed.

src/hlua.c

@@ -5584,7 +5584,7 @@ __LJMP static int hlua_txn_done(lua_State *L)
 	if (!(s->flags & SF_FINST_MASK))
 		s->flags |= finst;
 
-	lua_pushinteger(L, ACT_RET_DONE);
+	lua_pushinteger(L, ACT_RET_ABRT);
 	WILL_LJMP(hlua_done(L));
 	return 0;
 }