Make "ApiError" the default error code for ApiError instances, rather than "Unknown."

Note Dashoard's error handling code:

        except boto.exception.BotoServerError, e:
            if e.status == 400 and e.error_code == 'ApiError':
                raise NovaApiError(e)
            elif e.status == 401:
                raise NovaUnauthorizedError()
            elif e.status == 503:
                raise NovaUnavailableError(e)
            raise NovaServerError(e)

So an error_code of 'Unknown' will raise an ugly exception.

This change also makes the euca errors a bit prettier:

> euca-attach-volume -i i-1 vol-2 -d /dev/vdb
> ApiError: ApiError: Volume status must be available


Rather than:

> euca-attach-volume -i i-1 vol-2 -d /dev/vdb
> Unknown: Unknown: Volume status must be available

Though the reiteration of the error code is still a bit ugly.

1 files changed, 1 insertions, 1 deletions

diff --git a/nova/exception.py b/nova/exception.py
index 93c5fe3d7..4e2bbdbaf 100644
--- a/nova/exception.py
+++ b/nova/exception.py
@@ -46,7 +46,7 @@ class Error(Exception):
 
 
 class ApiError(Error):
-    def __init__(self, message='Unknown', code='Unknown'):
+    def __init__(self, message='Unknown', code='ApiError'):
         self.message = message
         self.code = code
         super(ApiError, self).__init__('%s: %s' % (code, message))