Update quickstart-openstack.md
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Merge branch 'patch-4' of https://github.com/natishalom/cloudifysource.github.com
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Merge branch 'patch-4' of https://github.com/natishalom/cloudifysource.github.com into natishalom-patch-4
Tweak @natishalom's pull request
Merge branch 'natishalom-patch-4'
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