Checkmk Werk 13197: Add space as valid URL character

ID: 13197 Title: Add space as valid URL character Component: Setup Level: 1 Class: Bug fix Version: 2.0.0p19 With Werk 13195 a stricter URL validation was introduced. In the original implementation the space character was not allowed. Unfortunately servicenames with spaces are not encoded properly and spaces used to work. Since this is also common behaviour and does not impose security risks the space is allowed again.