Comment 1 for bug 1789654

Logs for the failed debian rocky run:

http://logs.openstack.org/75/597175/1/check/puppet-openstack-integration-4-scenario001-tempest-debian-stable-luminous/fd38fcf/logs/

This was also reported by the xenserver CI:

http://lists.openstack.org/pipermail/openstack-dev/2018-August/133896.html

My guess is the local ProviderTree cache of inventory thinks nothing has changed when we set allocation_ratio on the provider inventory so it never actually updates the inventory remotely and we're left with initial values of 0.0.