Remove support of blocking cache

• Type: Task
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: 7.0.X, 7.1.X, 7.2.X, Master
• Component/s: Performance > Caching Infrastructure
• Labels:
  • pt-app-security-review
• Branch Version/s:
  7.2.x, 7.1.x, 7.0.x
• Backported to Branch:
  Committed

Blocking cache together with transactional cache performs poorly, and we can not disable transactional cache cause it will cause function failures, so blocking cache can never be enabled and should be removed