RHEL6 accepts crypto settings from openssh 5.9

Signed-off-by: Wojciech Kopras <wojciech.kopras@yahoo.com>

Author: Wojciech Kopras

libraries/ssh_crypto.rb

@@ -100,7 +100,7 @@ def valid_kexs # rubocop:disable Metrics/CyclomaticComplexity, Metrics/MethodLen
     when 'redhat', 'centos', 'oracle'
       case inspec.os[:release]
       when /^6\./
-        kex = nil
+        kex = kex59
       when /^7\./
         kex = kex66
       end
@@ -153,7 +153,7 @@ def valid_macs # rubocop:disable Metrics/CyclomaticComplexity, Metrics/MethodLen
     when 'redhat', 'centos', 'oracle'
       case inspec.os[:release]
       when /^6\./
-        macs = macs53
+        macs = macs59
       when /^7\./
         macs = macs66
       end