Mention failed url on http error

[larstiq]

Got the following backtrace, which by itself does not have enough information:

2017-06-30 11:23:41,451 RuoteAMQP.participant ERROR: Exception in participant change_request_state
while handling instance 20170630-1113-herarage-puyudene of process BOSS_handle_SR
Note: for information only. Participant remains functional.
Error is being signalled to the workflow (unless this workitem is 'forgotten').

2017-06-30 11:23:41,452 RuoteAMQP.participant ERROR:
------------------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/RuoteAMQP/participant.py", line 84, in run
    self.__participant.consume()
  File "/usr/lib/python2.7/site-packages/SkyNET/Exo.py", line 80, in consume
    self.exo.handler.handle_wi(self.workitem)
  File "/usr/share/boss-skynet/change_request_state.py", line 170, in handle_wi
    self.handle_request(wid)
  File "/usr/share/boss-skynet/change_request_state.py", line 141, in handle_request
    res = self.obs.setRequestState(str(rid), str(newstate), str(msgstring))
  File "/usr/lib/python2.7/site-packages/buildservice/api.py", line 1153, in setRequestState
    ret = core.change_request_state(self.apiurl, rid, new_state, message=msg)
  File "/usr/lib/python2.7/site-packages/osc/core.py", line 3643, in change_request_state
    f = http_POST(u, data=message)
  File "/usr/lib/python2.7/site-packages/osc/core.py", line 2922, in http_POST
    def http_POST(*args, **kwargs):   return http_request('POST', *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/osc/core.py", line 2909, in http_request
    fd = urllib2.urlopen(req, data=data)
  File "/usr/lib64/python2.7/urllib2.py", line 126, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib64/python2.7/urllib2.py", line 400, in open
    response = meth(req, response)
  File "/usr/lib64/python2.7/urllib2.py", line 513, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib64/python2.7/urllib2.py", line 432, in error
    result = self._call_chain(*args)
  File "/usr/lib64/python2.7/urllib2.py", line 372, in _call_chain
    result = func(*args)
  File "/usr/lib64/python2.7/urllib2.py", line 872, in http_error_401
    url, req, headers)
  File "/usr/lib64/python2.7/urllib2.py", line 850, in http_error_auth_reqed
    return self.retry_http_basic_auth(host, req, realm)
  File "/usr/lib64/python2.7/urllib2.py", line 860, in retry_http_basic_auth
    return self.parent.open(req, timeout=req.timeout)
  File "/usr/lib64/python2.7/urllib2.py", line 400, in open
    response = meth(req, response)
  File "/usr/lib64/python2.7/urllib2.py", line 513, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib64/python2.7/urllib2.py", line 438, in error
    return self._call_chain(*args)
  File "/usr/lib64/python2.7/urllib2.py", line 372, in _call_chain
    result = func(*args)
  File "/usr/lib64/python2.7/urllib2.py", line 521, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
HTTPError: HTTP Error 404: Not Found