Add kitchen tests for FreeBSD

.kitchen.yml

   - name: ubuntu-14.04
   - name: ubuntu-16.04
   - name: debian-8.5
+  - name: freebsd-10.3
+    driver:
+      cache_directory: false
+  - name: freebsd-11.0
+    driver:
+      cache_directory: false
 
 provisioner:
   name: salt_solo

test/integration/default/serverspec/openssl_server_spec.rb

 
 def service_name()
   return case os[:family]
-    when 'redhat' then 'sshd'
     when 'debian', 'ubuntu' then 'ssh'
+    else 'sshd'
+  end
+end
+
+def root_group()
+  return case os[:family]
+    when 'freebsd' then 'wheel'
+    else 'root'
   end
 end
 
   describe file('/etc/ssh/sshd_config') do
     it { should be_mode 600 }
     it { should be_owned_by 'root' }
-    it { should be_grouped_into 'root' }
+    it { should be_grouped_into root_group() }
   end
 
   describe file('/etc/ssh/ssh_config') do
     it { should be_mode 644 }
     it { should be_owned_by 'root' }
-    it { should be_grouped_into 'root' }
+    it { should be_grouped_into root_group() }
   end
 
 end