Wrong detection of os version number on debian 8

[chris-rock]

As already detected with dev-sec/puppet-ssh-hardening/issues/48 debian 8 does not return its version number with cat /etc/debian_version

Therefore the installation of the ssh modules does not produce the expected output:

       rspec /tmp/busser/suites/serverspec/ssh_spec.rb:142 # check sshd_config File "/etc/ssh/sshd_config" content should match /^MACs hmac-sha2-512,hmac-sha2-256,hmac-ripemd160$/
       rspec /tmp/busser/suites/serverspec/ssh_spec.rb:142 # check sshd_config File "/etc/ssh/sshd_config" content should match /^KexAlgorithms diffie-hellman-group-exchange-sha256$/
       rspec /tmp/busser/suites/serverspec/ssh_spec.rb:142 # check sshd_config File "/etc/ssh/sshd_config" content should match /^UsePrivilegeSeparation sandbox$/
       rspec /tmp/busser/suites/serverspec/ssh_spec.rb:142 # check ssh_config File "/etc/ssh/ssh_config" content should match /^MACs hmac-sha2-512,hmac-sha2-256,hmac-ripemd160$/
       rspec /tmp/busser/suites/serverspec/ssh_spec.rb:142 # check ssh_config File "/etc/ssh/ssh_config" content should match /^KexAlgorithms diffie-hellman-group-exchange-sha256$/

[artem-sidorenko]

@chris-rock on the current bento box, I get the proper version

# cat /etc/debian_version 
8.6

All tests are also running fine. So I'm closing this, feel free to reopen of needed