Rename Grenade's DEST to STACK_ROOT

This is to avoid confusion with DevStack's DEST which is set to
${STACK_ROOT}/$BASE_RELEASE in Grenade.

Change-Id: Ibc9b94bd51e7d5dd82ec45f23557923d2f38db96
Swift updates

* Add some Javelin test files to swift storage
* Remove call to swift_init()

Change-Id: I14c1d50c13563cbc5fbb71de014e318951b6f62b
Merge branch 'swift-fixes' into dt-test