Checkmk Werk 7967: Fix blocked liveproxy after executing livestatus commands

[Lars Michelsen]

ID:          7967
Title:       Fix blocked liveproxy after executing livestatus commands
Component:   Livestatus Proxy
Level:       2
Class:       Bug fix
Version:     1.7.0i1

The 1.6.0b3 release introduced an regression which made the liveproxyd treat
channels to sites as blocked after executing a livestatus command. When
executing multiple commands this resulted in a busy site and finally GUI
timeouts, because all channels were blocked.