Customized error raised in Python model needs be passed back to client

[lennon310]

(1) Change IOException to explicit InvalidProtocolBufferException.

(2) Avoid re-throwing the APIException thrown when httpResponse.getStatusCode() is non-2xx. However, any other exception is still caught and thrown as APIExeption.

(3) Directly throw the exception with the payload as its message. The payload will be the dict defined in user defined exception in Python model.

(4) The exception wrapper (ExceptionControllerAdviceclass) should create SeldonMessage instead of Status (bug fix).

[seldondev]

Hi @lennon310. Thanks for your PR.

I'm waiting for a SeldonIO or seldonio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[axsaucedo]

/cc @adriangonz

[ukclivecox]

/ok-to-test

[axsaucedo]

/ok-to-test

[adriangonz]

/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

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