detect/analyzer: Suppress direction warnings

This commit suppresses direction warnings by the rules analyzer for ICMP
and ICMPV6 since it's not actionable.

src/detect-engine-analyzer.c

@@ -1189,10 +1189,14 @@ void EngineAnalysisRules(const DetectEngineCtx *de_ctx,
         warn_no_direction += 1;
         rule_warning += 1;
     }
+
+    /* No warning about direction for ICMP protos */
+    if (!(DetectProtoContainsProto(&s->proto, IPPROTO_ICMP) && DetectProtoContainsProto(&s->proto, IPPROTO_ICMP))) {
         if ((s->flags & (SIG_FLAG_TOSERVER|SIG_FLAG_TOCLIENT)) == (SIG_FLAG_TOSERVER|SIG_FLAG_TOCLIENT)) {
             warn_both_direction += 1;
             rule_warning += 1;
         }
+    }
 
     if (!rule_warnings_only || (rule_warnings_only && rule_warning > 0)) {
         fprintf(rule_engine_analysis_FD, "== Sid: %u ==\n", s->id);