Add v3 curl examples

There were curl examples for v2 APIs, but none for V3. This change
adds some that I've found handy.

Also, added an example of getting the revocation list using the v2
API. This is handy for checking token revocations.

Partial-Bug: #1283943

Change-Id: I228dc479b29db730873ba95207e4ace85c20e1fe
Merge "Add v3 curl examples"