Replace hardcoded volume size by created volume size

If the volumes_client is configured to use a volume_size different
from the hardcoded value "1", an error will be raised.
This patch replaces the hardcoded value by the actual size of the
created volume.

Closes-Bug: 1430375

Change-Id: Ie6593b5c60c697b62a65a38d37e4942e9e80cc10
2 files changed