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

[Debian testing autoremoval watch]

ruby-net-ssh 1:2.9.2-2 is marked for autoremoval from testing on 2016-03-10

It is affected by these RC bugs:
812736: ruby-net-ssh: FTBFS: /usr/lib/ruby/2.2.0/rubygems/specification.rb:927:in `block in find_by_path': undefined method `contains_requirable_file?' for nil:NilClass (NoMethodError)