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

[Debian testing autoremoval watch]

ruby-serverspec 2.37.2-1 is marked for autoremoval from testing on 2017-09-03

It is affected by these RC bugs:
869177: ruby-serverspec: FTBFS: can't satisfy 'net-ssh (< 4.0, >= 2.7)', already activated 'net-ssh-4.1.0' (Gem::LoadError)

It (build-)depends on packages with these RC bugs:
869164: ruby-net-scp: ruby-net-scp FTBFS: test failures
869175: ruby-specinfra: FTBFS: can't satisfy 'net-ssh (< 4.0, >= 2.7)', already activated 'net-ssh-4.1.0' (Gem::LoadError)