Move initialize method later.

qa/qa/runtime/rsa_key.rb

@@ -6,13 +6,13 @@ module QA
     class RSAKey
       extend Forwardable
 
+      attr_reader :key
+      def_delegators :@key, :fingerprint
+
       def initialize(bits = 4096)
         @key = OpenSSL::PKey::RSA.new(bits)
       end
 
-      attr_reader :key
-      def_delegators :@key, :fingerprint
-
       def public_key
         @public_key ||= "#{key.ssh_type} #{[key.to_blob].pack('m0')}"
       end