Tell user that cloning will take a while
Tell user that cloning will take a while

Cloning a node disk from the basedisk takes quite a while (half a minute
or more). During that time disk activity is the only sign of progress.
This patch informs the user that a delay is to be expected.

Change-Id: I8b206e32c2dd89dd01cc23ee999ee0815f38fcd4

openstack/training-labs,openstack/training-labs,openstack/training-labs