Add a crypto policy fallback in case Security Property 'crypto.policy' does not exist

JceSecurity.java

- Path cpPath = Paths.get(cryptoPolicyProperty);

   if ((cryptoPolicyProperty == null) ||
           (cpPath.getNameCount() != 1) ||
           (cpPath.compareTo(cpPath.getFileName()) != 0)) {
       throw new SecurityException(
           "Invalid policy directory name format: " +
           cryptoPolicyProperty);
   }

+ Path cpPath = Paths.get(cryptoPolicyProperty);