The update function was using reflect to determine the object type and
creating new pointer. First of all, it was actually returning the
pointer to pointer to the object which does not implement
interfaces.Object so all reflect calls were failing.

I tried to fix that with Elem call but that returns the type with zero
value and since the type is pointer its zero value is nil. However
client requires pointer to empty struct not nil pointer. I have not
figured out a way so I added the comment. For now I'm accepting the
ExistingObject empty struct directly and using it.

The create function wraps errors which causes Kubernetes error
functions to not detect the specific types of errors. This commit
fixes it by checking the underlying error instead of error directly.

Also, all calls were calling update (even with successful
create). This commit adds a check for only those where create failed
with IsAlreadyExists error will it call update.

delete function was not checking for error and directly checking for
specific type of error. This was leading to every call returning
error. This commit fixed it by adding a check for non-nil errors
first.

Operations package implements lower-level functions and Objects which
will be used by other Objects to interact with the cluster.