No check whether snapshot belongs to stack

[huangtianhua]

1. create a stack: stack1
2. snapshot for stack1: snapshot1
3. create another stack with same template: stack2, so the two stacks has same resource names
4. heat snapshot-delete stack2 snapshot1
5. the snapshot1 be deleted, glance image-list, can't find the snapshot image

excepted: tell user the snapshot1 can't be found in stack1, and don't to delete the snapshot image

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/168766

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/168766
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=af6b0db444b33126150c0273662672b3736aac6a
Submitter: Jenkins
Branch: master

commit af6b0db444b33126150c0273662672b3736aac6a
Author: huangtianhua <email address hidden>
Date: Mon Mar 30 11:33:43 2015 +0800

    Make sure snapshot belongs to stack for actions

    Check the snapshot belongs to stack when deleting and showing
    stack's snapshot, and restoring from snapshot.

    Change-Id: I8ce170b40b05ae17669524d75f80e06e39986673
    Closes-Bug: #1437602