[DRE-maint] ruby-net-ssh is marked for autoremoval from testing

[Debian testing autoremoval watch]

ruby-net-ssh 1:5.0.2-2 is marked for autoremoval from testing on 2019-03-04

It is affected by these RC bugs:
919818: ruby-net-ssh, src:test-kitchen: ruby-net-ssh breaks test-kitchen autopkgtest