test: update async_no_yield test from vconnect test group

After tarantool/tarantool#9489 was fixed, we can now update the test to
reflect the correct behaviour. However, we still need to test the incorrect
behaviour for older versions of Tarantool to which the bugfix was not
backported to.

Closes #456

NO_DOC=<test>

test/replicaset-luatest/vconnect_test.lua

@@ -176,8 +176,12 @@ test_group.test_async_no_yield = function(g)
     local csw1 = fiber.self():csw()
     local ret, err = rs:callrw('get_uuid', {}, opts)
     local csw2 = fiber.self():csw()
-    -- Waiting for #456 to be fixed.
-    t.assert_equals(csw2, csw1 + 1)
+    if vutil.version_is_at_least(2, 11, 0, nil, 0, 0) then
+        t.assert_equals(csw2, csw1)
+    else
+        -- Due to tarantool/tarantool#9489 bug.
+        t.assert_equals(csw2, csw1 + 1)
+    end
     t.assert_str_contains(err.name, 'VHANDSHAKE_NOT_COMPLETE')
     t.assert_equals(ret, nil)
     t.assert_not_equals(rs.master.conn.state, 'closed')