Bug 1509799 - Fix WaitAndGetVNID() in sdn node
Bug 1509799 - Fix WaitAndGetVNID() in sdn node

- Existing 1 sec timeout for WaitAndGetVNID() may not be sufficient
  for loaded nodes (I might have chosen this value due to lack of enough info).
  Now the timeout is bumped to 5 secs.

- WaitAndGetVNID() also queries the api server if needed (do not expect this
  to happen with the new timeout) to differentiate between these 2 cases:
  (1) Genuine error: Namespace doesn't exist so netid won't be present
  (2) Propagation issue: Namespace exists but watch NetNamespace event not
      propagated to the node. May be insufficient timeout or event missed.
      Newly added VnidNotFoundErrors metric will give more insights.

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