PLT-6761 fixing unit tests (#6671)

store/sql_user_store_test.go

@@ -1501,7 +1501,7 @@ func TestUserStoreSearch(t *testing.T) {
 	c1 := model.Channel{}
 	c1.TeamId = tid
 	c1.DisplayName = "NameName"
-	c1.Name = "a" + model.NewId() + "b"
+	c1.Name = "zz" + model.NewId() + "b"
 	c1.Type = model.CHANNEL_OPEN
 	c1 = *Must(store.Channel().Save(&c1)).(*model.Channel)