Fix ephemeral mounts

 * Correct flake8 errors
 * move again to full devpaths for blockmapping
Merge branch 'add-ephemeral-drives' into ubuntu-dev
Fix ephemeral mounts

 * Abstract in manifest option
Merge branch 'add-ephemeral-drives' into ubuntu-dev

 * Abstract into manifest option

Conflicts:
	bootstrapvz/providers/ec2/tasks/ami.py