This patch fixes a few syntax issues required for Ansible 2
compatibility that Ansible 1.x was more lenient with.
When a 'when' clause is combined with a 'with_*' statement, the clause
is processed separately for each item. Tasks with 'when' clauses which
depended on an item variable being defined have either applied a default
empty value to the item or a new task individual task has been created
for each item in the loop.
Tasks within the os-cinder-install playboook have been updated to loop
through cinder_backends as a hash.
Change-Id: I9b53eb5dd709a6bed1797961015aa3dd328340f3
2a12ea385e