Added exception for HTTP 412/Precondition Failed

pillarsdk/api.py

@@ -161,6 +161,8 @@ class Api(object):
             raise exceptions.ResourceConflict(response, content)
         elif status == 410:
             raise exceptions.ResourceGone(response, content)
+        elif status == 412:
+            raise exceptions.PreconditionFailed(response, content)
         elif status == 422:
             raise exceptions.ResourceInvalid(response, content)
         elif 401 <= status <= 499:

pillarsdk/exceptions.py

@@ -78,6 +78,11 @@ class ResourceGone(ClientError):
     pass
 
 
+class PreconditionFailed(ClientError):
+    """412 Precondition Failed"""
+    pass
+
+
 class ResourceInvalid(ClientError):
     """422 Invalid
     """