kcollectd is marked for autoremoval from testing

[Debian testing autoremoval watch]

kcollectd 0.9-5 is marked for autoremoval from testing on 2019-05-03

It (build-)depends on packages with these RC bugs:
924337: collectd: Please reenable mqtt and varnish
925420: collectd: disabled mqtt in build breaks upgrades on configs with mqtt