CYBS-737: Removed unused imports

Author: sumadhav

java/src/main/java/com/cybersource/ws/client/SecurityUtil.java

@@ -1,6 +1,5 @@
 package com.cybersource.ws.client;
 
-import org.apache.commons.lang3.StringUtils;
 import org.apache.ws.security.WSConstants;
 import org.apache.ws.security.WSEncryptionPart;
 import org.apache.ws.security.WSSecurityException;