views: improve request error reporting

Add specific error messages for each http status code in the
function ogserver_error(). Pass the request object to obtain the
status code.

Standarize the error handling code for every get(), delete() and
post() as:
r = server.get('/scopes')
if not r:
    return ogserver_down('scopes')
if r.status_code != requests.codes.ok:
    return ogserver_error(r, 'scopes')

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