Enforce noninstantiability to UtilHttp class

• Make class as final.
• Add a private constructor.
• Make the following public static variables as private

      public static final String MULTI_ROW_DELIMITER = "_o_";
      public static final String ROW_SUBMIT_PREFIX = "_rowSubmit_o_";
      public static final String COMPOSITE_DELIMITER = "_c_";
      public static final int MULTI_ROW_DELIMITER_LENGTH = MULTI_ROW_DELIMITER.length();
      public static final int ROW_SUBMIT_PREFIX_LENGTH = ROW_SUBMIT_PREFIX.length();
      public static final int COMPOSITE_DELIMITER_LENGTH = COMPOSITE_DELIMITER.length();
  
      public static final String SESSION_KEY_TIMEZONE = "timeZone";
  

• Add public static methods as getMultiRowDelimiter(), getRowSubmitPrefix(), and use them in following classes/scripts;

      GlEvents.java
      ShoppingCartEvents.java
      CheckAction.groovy
      CheckRejected.groovy
      ServiceMultiEventHandler.java
      EbayEvents.java
  

No variables needs to be change for this class.