Add 'iml debugapi' to iml cli

[utopiabound]

debugapi does not show up in help as it's for test/debug

Related #1832

Signed-off-by: Nathaniel Clark nclark@whamcloud.com

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This change is 

[utopiabound]

[root@adm ~]# iml debugapi get target
{"meta":{"limit":20,"next":null,"offset":0,"previous":null,"total_count":0},"objects":[]}

[ip1981]

How is it better than curl? :)

# curl http://127.0.0.1:8001/api/filesystem/
{"meta": {"limit": 20, "next": null, "offset": 0, "previous": null, "total_count": 1}, "objects": [{"cdt_mdt": "/api/target/2/", ...

[jgrund]

How is it better than curl? :)

API may be setup as read-only and certain verbs (POST, PUT, ...) are usually protected via auth

[utopiabound]

POST tested and works

[jgrund]

Any HTTP request could technically carry a body. In addition, a non-GET response could also have a body (and I think some of our API does this).

It's probably best to separate the body addition and response parsing out of each individual Verb, and add the request body / attempt at response body parsing after the match.

For response body, we can check both the content-type header on the return and the content length to decide whether we should decode to JSON.

[nlinker]

Headers and bodies are not supported, is it intentional?

[jgrund]

Bodies are supported here: https://github.com/whamcloud/integrated-manager-for-lustre/pull/2132/files#diff-f33d40dcab0b4085abfc004fe3408e29R50-R54

Headers generally aren't needed (currently) when using the ```iml_manager_client``