Log the exception when we get one.

Change-Id: Iee478c8f300b608dd153e3400bd17866f52543c5

bin/nova-ajax-console-proxy

@@ -102,7 +102,8 @@ class AjaxConsoleProxy(object):
                           % (req_url, str(env)))
             start_response("401 NOT AUTHORIZED", [])
             return "Not Authorized"
-        except Exception:
+        except Exception, exc:
+            LOG.exception(exc)
             start_response("500 ERROR", [])
             return "Server Error"