Remove unused exception
Remove unused exception

This patch removes some exceptions which are not used.

Partially implements blueprint senlin-exception-handling

Change-Id: I5798ac84207a1e141b6701b9cebe20faefa5f28f

tengqm/senlin-container,Alzon/senlin,stackforge/senlin,openstack/senlin,openstack/senlin,stackforge/senlin,tengqm/senlin-container,Alzon/senlin,openstack/senlin