Swift storage heat templates

Updated the existing swift-source template to properly list all
swift devices.

Created a new swift-storage-source template to add additional
swift-storage only nodes.

The default SWIFTSTORAGESCALE is 0. Change this number to add
additional swift storage nodes.

Change-Id: Ia05f4ad44593316430d60541106d23b032c3e760
Merge "Swift storage heat templates"