ISPN-3830 Conditional Operation can fail erroneously during ST

The scenario described in the bug was actually working, because the
command was forwarded to the new primary owner. However, it did cause an
unnecessary retry because of the additional topology check in
EntryWrappingInterceptor.
ISPN-3830 Conditional Operation can fail erroneously during ST

* Fixed refactored imports
Changed assertions to use test framework assertions
Fixed SKIP_REMOTE_STORE to only mean when persisting entries
ISPN-4820 Change Size method on Cache to return the contents of the
entire cluster

* SizeCommand now uses entry iterator