Update dev-vm-openSUSE.md
Add Crowbar personas and use cases

Move content from http://crowbar.sync.in/crowbar-usecases to Git, so
it's more accessible and visible to Crowbarians. Also makes it easier to
be kept up to date.
Merge pull request #1790 from jamestyj/jamestyj-use-cases

Add Crowbar personas and use cases
Add support for SLES in dev-vm docs