Check_MK Werk 2630: fixed incorrect check interval of Check_MK Discovery

ID: 2630 Title: fixed incorrect check interval of Check_MK Discovery Component: Core & Setup Level: 1 Class: Bug Fix Version: 1.2.7i3 After werk #2595 the periodic discovery time configured through the rule was stored as seconds instead of minutes, causing the check frequency to be 60 times slower than intended.