Description of problem:
Interrupting the client with Control-C produces too much error information.  We should avoid printing a traceback in this case.

Version-Release number of selected component (if applicable):
0:1.2.2-1.fc13

How reproducible:
Always

Steps to Reproduce:
1. zanata publican push for a large project
2. interrupt with Ctrl+C
  
Actual results:
^CTraceback (most recent call last):
  File "/usr/bin/zanata", line 26, in <module>
    client.run()
  File "/usr/lib/python2.6/site-packages/zanataclient/zanata.py", line 1398, in run
    self._push_publican(command_args)
  File "/usr/lib/python2.6/site-packages/zanataclient/zanata.py", line 999, in _push_publican
    self.import_po(publicanutil, trans_folder, zanata, project_id, iteration_id, filename)
  File "/usr/lib/python2.6/site-packages/zanataclient/zanata.py", line 481, in import_po
    result = zanata.documents.commit_translation(project_id, iteration_id, request_name, lang, body)
  File "/usr/lib/python2.6/site-packages/zanataclient/zanatalib/docservice.py", line 151, in commit_translation
    res, content = self.projects.restclient.request_put('/seam/resource/restv1/projects/p/%s/iterations/i/%s/r/%s/translations/%s'%(projectid,iterationid,fileid,localeid), args=resources, headers=headers)
  File "/usr/lib/python2.6/site-packages/zanataclient/zanatalib/rest/client.py", line 49, in request_put
    return self.request(resource, "put", args, body, headers, extension, copytrans = copytrans)
  File "/usr/lib/python2.6/site-packages/zanataclient/zanatalib/rest/client.py", line 72, in request
    response, content = http.request("%s%s%s" % (self.base_url, resource, ext), method.upper(), body, headers=headers)
  File "/usr/lib/python2.6/site-packages/httplib2/__init__.py", line 1068, in request
    (response, content) = self._request(conn, authority, uri, request_uri, method, body, headers, redirections, cachekey)
  File "/usr/lib/python2.6/site-packages/httplib2/__init__.py", line 872, in _request
    (response, content) = self._conn_request(conn, request_uri, method, body, headers)
  File "/usr/lib/python2.6/site-packages/httplib2/__init__.py", line 842, in _conn_request
    response = conn.getresponse()
  File "/usr/lib/python2.6/httplib.py", line 974, in getresponse
    response.begin()
  File "/usr/lib/python2.6/httplib.py", line 391, in begin
    version, status, reason = self._read_status()
  File "/usr/lib/python2.6/httplib.py", line 349, in _read_status
    line = self.fp.readline()
  File "/usr/lib/python2.6/socket.py", line 397, in readline
    data = recv(1)
KeyboardInterrupt


Expected results:
^C

Additional info: