Support deletion policy for stack-resource

Registered by huangtianhua on 2015-06-24

We should support the deletion policy for stack-resources, such as autoscaling group, resource group, heat autoscaling group and so on:
1. the deletion policy of stack-resource is DELETE ----ok
2. the deletion policy of stack-resource is SNAPSHOT ----now will failed in resource.validate(), so to add handle_snapshot_delete(*) implementation for stack-resources, to snapshot for nested resources, and then to delete the nested stack and resources
3. the deletion policy of stack-resource is RETAIN ----now the records of nested stack and nested resources are residual in heat, may be we can implementation delete() for stack-resource

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
huangtianhua
Direction:
Needs approval
Assignee:
huangtianhua
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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Gerrit topic: https://review.openstack.org/#q,topic:bp/support-deletion-policy-for-stack-resource,n,z

Addressed by: https://review.openstack.org/195984
    Support deletion policy for stack resource

Addressed by: https://review.openstack.org/196563
    Support deletion policy for resource group

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