liusheng 3377106557 Return the error message of API request failure
For now, the error message from Aodh API can not be return when a request
failure occur(e.g. BadRequest, Conflict). That is because the fualtstring
from the response isn't extracted correctly.

Change-Id: I5e0048f969d2e852042c4aa2c7e6e0bff254d15b
2016-02-17 15:26:20 +08:00
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