conpaas xtreemfs: handle device renaming on ec2 (sdb -> xvdb)


git-svn-id: svn://svn.forge.objectweb.org/svnroot/contrail/trunk/conpaas@5556 ef35cc4a-2640-4bbf-98bc-65920db7d8ae
conpaas xtreemfs: delete app after downloading its manifest if it contains an xtreemfs service

Deleting the application is the safest thing to do to ensure proper data
snapshotting when downloading an application manifest containing a persistent
xtreemfs service.

This patch does just that, prompting users for confirmation before proceeding.


git-svn-id: svn://svn.forge.objectweb.org/svnroot/contrail/trunk/conpaas@5562 ef35cc4a-2640-4bbf-98bc-65920db7d8ae