Replaces WADL references with links to API Reference

- Moves detailed info to the Compute API v2 WADL itself
- Alleviates the following issues:
  * Params are not documented in this output due to tooling
  * When a WADL was broken, this deliverable breaks also
  * WADL contributions are low
  * It's difficult to train contributors how to embed WADL references

Change-Id: Id56da05c0409ed432dfdd0f5de799f5ed5e2e47c
Add new checklinks tox environment

Change-Id: Ia01d27d48a333e79e8d10ee4a85958e23fc3b35f