[DRE-maint] vagrant-cachier is marked for autoremoval from testing

[Debian testing autoremoval watch]

vagrant-cachier 1.2.1-1 is marked for autoremoval from testing on 2016-03-10

It (build-)depends on packages with these RC bugs:
812735: ruby-net-scp: 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)
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)