Add a "mock" mode

[thomas-fossati]

We want to enable some early end-to-end testing of ratsd, without a real backend.

For that, we could have "mock" mode where custom evidence can be supplied from the command line, e.g.:

ratsd mock --evidence my-cmw-file.json

[iolivergithub]

curl -X POST http://x.y.z.w:1234/mock/uuuu?param1=x&param2=y -d '{ "bodyparam1":"xyz" }

Replace uuuu,x,y,z,xyz with whatever is required (if at all).

Also required are a few example CMW files

[cowbon]

curl -X POST http://x.y.z.w:1234/mock/uuuu?param1=x&param2=y -d '{ "bodyparam1":"xyz" }

Replace uuuu,x,y,z,xyz with whatever is required (if at all).

Also required are a few example CMW files

PR #39 will bring in the MockTSM sub-attester, which is available all the time. I personally don't consider /mock is needed because /chares always returns the output from MockTSM .