Adds tenant_id to guest_info in heat code

Reasons:
- Heat code and used mysql/heat.template are missing tenant_id
- tenant_id is needed to simplify the identification of owner
  of the instance.

Changes:
- Adds tenant_id to heat.template and in heat code.

Change-Id: I08a8703e8d5f3db627a280c9df774d734437fcea
Closes-Bug: #1263159
Add volume total to Mgmt Instance Get

Add volume.total attribute and value to instance info returned by
mgmt show/get call in addition to volume.used.

This will help in validating cinder volume size reflects actual
filesystem size.

Change-Id: Ia89269edbf90b91967dedcc787dd54f8a56695de
Implements: blueprint add-volume-total-attribute
Update for datastore tests to support multiple datastore types

This resolves some issues with datastore tests
Change-Id: I6065dc763b0e3c7df55986100dff9416401bc97e
Merge "Update for datastore tests to support multiple datastore types"
Merge "Add volume total to Mgmt Instance Get"
Merge "Adds tenant_id to guest_info in heat code"