compatibility with the CIS profile

Removing the `s` of `30s` makes it compatible with the `<60` of the CIS profile.

Author: micheelengronne

controls/sshd_spec.rb

@@ -220,7 +220,7 @@
   title 'Server: Specify LoginGraceTime'
   desc 'The LoginGraceTime gives the user 30 seconds to accomplish a login. This could be used to conduct a Denial of Service (DoS) against a running SSH daemon.'
   describe sshd_config do
-    its('LoginGraceTime') { should eq('30s') }
+    its('LoginGraceTime') { should eq('30') }
   end
 end