Http handler returns 200 OK on command panic

[fabiobozzo]

My team's fork of Kubo runs on a few custom interface implementations, notably the Pinner.
Recently, we found a bug in one of them which caused a panic, in the context of a command.

We were surprised to find out that the http API returns 200 OK, in case of panic.
In order to demonstrate that behaviour, I opened a PR, with a couple of new http handler tests.
See: #250

[welcome]

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[lidel]

Thank you, the remaining work will land in Kubo