Fix CollectionUtils Test

[JPDSousa]

CollectionUtils is not being properly tested.

[yashdeeph709]

Can you tell what do we want from it. I am unable to find a suitable test that should be added!

[JPDSousa]

The problem i found out with the tests for CollectionUtils is that it is not being tested in for a real use-case scenario.

At the moment, CollectionUtils is used in only in the ByteCollectionCodec so that byte arrays can be deserialized back to the original type. In the future i want to use it in array serilialization/deserialization for the same purposes.

What i want is to be able to test something like this:

Collection<T> col1 = new HashSet<T>();
Collection<T> sameTypeAsCol1 = CollectionUtils.create(col1.getClass());

However, i was getting some compile time errors due to class casting.