Adds new method for rule merge

IMPORTANT: SecDefaultAction specified on a child configuration will
overwrite the ones specified on the parent; Previously it was
concatenating.

src/operators/validate_utf8_encoding.h

@@ -40,7 +40,7 @@ class ValidateUtf8Encoding : public Operator {
 
     bool evaluate(Transaction *transaction, RuleWithActions *rule,
         const std::string &str,
-        std::shared_ptr<RuleMessage> ruleMessage) override;
+        RuleMessage *ruleMessage) override;
 
     static int detect_utf8_character(const unsigned char *p_read,
         unsigned int length);