[PATCH] rest: ensure identity plugin follows docs

[fence]

Hello again,

I noticed that the identity rest api doesn't follow the docs.

`POST /identity` should return `201 Created` but returns `204 No 
Content` 
(https://git.gnunet.org/gnunet-handbook.git/tree/developers/rest-api/identity.rst#n134). 
While The response is also empty I think returning 201 is more suited 
for the nature of the endpoint.

The attached patch fixes that.

kind regards,
fence

0001-rest-ensure-identity-plugin-follows-docs.patch
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