Fix the request path of Telemetry API v2

Currently, there is no concept of tenant segregation, and the request
path of Telemetry API v2 is "/v2/{resource}" not the
"v2/{tenant_id}/resource", this patch correct it.

Change-Id: I9e7f28ca22ca0d884951c10f65a89b154e041ce2
Closes-Bug: #1343903