We use pool property directly when create/update/delete/show pool member.
Which will try to translate and raise value error when it's actually pool
not found. In cases like pool can not be found, we will raise NotFound
exception instead a value error.
Story: #1747836
Task: #16037
Change-Id: Ibc8f5d125436f0f8c9ea5a62d5be4e4f8b3c4401