Check_MK Werk 5828: Handle case-insensitive equality correctly in Livestatus.

ID: 5828 Title: Handle case-insensitive equality correctly in Livestatus. Component: Livestatus Level: 1 Class: Bug fix Version: 1.5.0i3 Equality-based Livestatus filters did not handle case-insensitivity correctly for non-ASCII characters. This has been fixed. The affected operators are =~ and !=~ for string-valued columns plus > and <= for list-valued columns. Note that regular expressions already handle case-(in)sensitivity correctly since werk 5672 ("Use RE2 regular expression engine for Livestatus queries").