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
Merge "Adds tenant_id to guest_info in heat code"