[FixRM: rapid7#7535] Missing normalize() in OptPort

[FixRM: rapid7#7535] - Sometimes OptPort can return as a String instead
of Fixnum because OptPort is missing the normalize() function.

Author: sinn3r

lib/msf/core/option_container.rb

@@ -302,6 +302,10 @@ def type
 		return 'port'
 	end
 
+	def normalize(value)
+		value.to_i
+	end
+
 	def valid?(value)
 		return false if empty_required_value?(value)