[manila] remove redundant tenant_id from v2 endpoints
[manila] remove redundant tenant_id from v2 endpoints

Allowed since Wallaby release:
"It is now possible to omit the %{project_id}s from the API endpoints for the v2 API.
While the behavior of the APIs have not been altered, the service recognizes
URLs with and without project ids in the path.
It is recommended that you adjust the service catalog in your cloud to remove the
project_id substitution, especially if you would like to enable users operating at
system scope."

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