Remove unused method

Signed-off-by: Richard Kosegi <richard.kosegi@gmail.com>

src/main/java/cloud/dnation/jenkins/plugins/hetzner/Helper.java

@@ -74,17 +74,6 @@ public static String getSSHPublicKeyFromPrivate(String privateKey, @Nullable Str
         return SSH_RSA + " " + Base64.getEncoder().encodeToString(bos.toByteArray());
     }
 
-    /**
-     * Get integer value of system property or default value if no such property exists.
-     *
-     * @param propName     name of property to get
-     * @param defaultValue default value to use if property is not defined
-     * @return integer value of property
-     */
-    public static int getIntPropOrDefault(String propName, int defaultValue) {
-        return Integer.parseInt(System.getProperty(propName, String.valueOf(defaultValue)));
-    }
-
     /**
      * Check if given string could possibly be label expression.
      *