Checkmk Werk 15553: time_period: making time-related validation more strict

ID: 15553 Title: time_period: making time-related validation more strict Component: REST API Level: 1 Class: Bug fix Version: 2.3.0b1 Prior to this werk, the REST API was quite lenient when it came to specifying a time allowing the format hh:mm for some while asking the hh:mm:ss format for others. This werk targets the active_time_ranges field where now a hh:mm:ss format is enforced. Due to the introduction of the more strict pattern, user scripts must be adjusted accordingly to respect the new format.