eliminate code warnings

Author: stefanseifert

conga-aem-plugin/src/main/java/io/wcm/devops/conga/plugins/aem/handlebars/helper/AemHttpdFilterHelper.java

@@ -93,21 +93,21 @@ private String generateRule(String ruleType, String ruleExpression, HttpdFilterT
           .append("    Deny from all\n");
       if (filterType == HttpdFilterType.DENY_ALLOW_ADMIN) {
         if (StringUtils.isNotBlank(allowFrom)) {
-          sb.append("    Allow from " + allowFrom + "\n");
+          sb.append("    Allow from ").append(allowFrom).append("\n");
         }
         if (StringUtils.isNotBlank(allowFromHost)) {
-          sb.append("    Allow from " + allowFromHost + "\n");
+          sb.append("    Allow from ").append(allowFromHost).append("\n");
         }
       }
       sb.append("  </IfVersion>\n")
           .append("  <IfVersion >= 2.4>\n")
           .append("    Require all denied\n");
       if (filterType == HttpdFilterType.DENY_ALLOW_ADMIN) {
         if (StringUtils.isNotBlank(allowFrom)) {
-          sb.append("    Require ip " + allowFrom + "\n");
+          sb.append("    Require ip ").append(allowFrom).append("\n");
         }
         if (StringUtils.isNotBlank(allowFromHost)) {
-          sb.append("    Require host " + allowFromHost + "\n");
+          sb.append("    Require host ").append(allowFromHost).append("\n");
         }
       }
       sb.append("  </IfVersion>\n");