GEODE-961 CI failure: PutAllCSDUnitTest.testPartialKeyInPRSingleHop

Gester and Hitesh puzzled through this failure and found that the client
sometimes does not receive the response from the server that the test
expects.  This caused the region size checks to fail even though the
client received an exception indicating a partial putAll.

I've removed the size checks from the test so that we now just care about
the correct exceptions having been thrown.