Check_MK Werk 5524: Check API: Fix set_item_state/get_rate/get_counter logic when called from check functions

ID: 5524 Title: Check API: Fix set_item_state/get_rate/get_counter logic when called from check functions Component: Checks & agents Level: 2 Class: Bug fix Version: 1.5.0i2 In the 1.5.0 branch, the logic encoding the current item in the key for saved data between checks was broken for checks with item and parse function. This did not affect the 1.4.0 branch.