Domain prototype

Change-Id: Id06fc7c41a0c2acade683d46efce4555caa8851a

Adding information about domain in the context

Adding the variables domain_id, project_domain_id and user_domain_id to
the RequestContext in order to be able to implement domain quotas. If no
domain information is in the header the variables are set to 'default',
since it's the default value for domain in Keystone V2.0 API.

Change-Id: Ice7805041d2df72d603e9d56a5df4cf7f5489992
Closes-bug: #1248936

Testing inclusion of domain id on project

Domain prototype

Inclusao

Inclusao

Inclusao

Inclusao

Inclusao 2

Inclusao 2

Inclusao 2

Inclusao 2]

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Tests finished