Remove Resp status code checks in stress tests

As response code checks is done at client side,
tests case do not need to check the same again.

This patch removes status code checks in stress tests.
All removed status code checks are present on client side.

Partially Implements blueprint: client-checks-success

Change-Id: I1f09b25d6d6d1c966a0635509d670c55d9415468
Merge "Remove Resp status code checks in stress tests"