BUG 1179 - rpcResult = false but response 200

Case for case when collection of errors is returned was added to
RestPostOperationTest.

Change-Id: Iea6c830d957001b01996e2640d8869105cf805ca
Signed-off-by: Jozef Gloncak <jgloncak@cisco.com>
Merge "BUG 1179 - rpcResult = false but response 200"