RAPI client: Handle urllib2.HTTPError and raise GanetiApiError

This allows users of the RAPI client to catch GanetiApiError for all HTTP
errors.

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

lib/rapi/client.py

@@ -419,6 +419,8 @@ class GanetiRapiClient(object):
       encoded_response_content = resp.read()
     except (OpenSSL.SSL.Error, OpenSSL.crypto.Error), err:
       raise CertificateError("SSL issue: %s (%r)" % (err, err))
+    except urllib2.HTTPError, err:
+      raise GanetiApiError(str(err), code=err.code)
 
     if encoded_response_content:
       response_content = simplejson.loads(encoded_response_content)