OS::Heat::SwiftSignal is replaced on every stack-update

[Pratik Mallya]

stack-update rebuilds a server in certain templates.

Steps to reproduce error:
1. create a stack using https://gist.github.com/pratikmallya/fad4e04eee1067eb74cb
2. update the stack using the same template
3. observed behavior: existing nova server is deleted, new nova server is created.

I observed that doing the same with just a cloud server will work as expected (i.e. cloud server is not rebuilt)

Tested on Rackspace Public Cloud

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/202162

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/205327

[OpenStack Infra (hudson-openstack)]

Change abandoned by Pratik Mallya (<email address hidden>) on branch: master
Review: https://review.openstack.org/202162
Reason: Patch set 6 resubmitted here:https://review.openstack.org/#/c/205327/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/205327
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=399040ece282ed0bbb5643694abda518271d0c74
Submitter: Jenkins
Branch: master

commit 399040ece282ed0bbb5643694abda518271d0c74
Author: Pratik Mallya <email address hidden>
Date: Wed Jul 15 10:53:48 2015 -0500

    Removes replace-on-update for SwiftSignalHandle resource

    Rebuilding the resource on every stack update results in a new
    url being generated. This causes any depending resources to
    be rebuilt, even when there are no changes in the template.

    Change-Id: Id385e0e8f9f68900b76a596a05ac99baceb831cc
    Closes-Bug: #1473692