Iss #129 - Add fix for statuses to look for duplicates at update time

• Clean up validation service to remove unused injected beans

• Iss #129 (closed) - Add fix for statuses to look for duplicates at update time

Previously, lists that could be multiple seconds old would be used as the base for updates to the commit status entities, meaning that any requests made around the same time could lead to duplicates. While introducing a little bit of latency to look up just before update, this will remove the risk of duplicates in most cases.