Quota per service plan (preserving plan upgrades)

[gberche-orange]

Expected behavior

As a cmdb operator, in order to protect against capacity issues or inappropriate massive provisionning, I need to be able to set quota per plan

Observed behavior

See https://github.com/orange-cloudfoundry/osb-cmdb-spike#backing-service-instance-target-strategies

SpacePerServicePlan enables setting a quota per plan. However this prevents upgrading a service instance to change plan (as Cf API does not allow to move a backend service among space)

Possible implementation

Osb-Cmdb provides additional quota UX beyond builtin Cf quotas such as:

• assigning quotas through meta-data: osb-cmdb.quota.plan.planid=3 assigned in the org/space