Pass correct project ID to get tenant_usages

The current implementation of tenant_quota_usages did not allow for
queries regarding projects that were not the currently active project,
this meant that when an admin went to edit or create a project it tried
to verify the usages against the wrong project. This patch adds the
code for passing a project id to the tenant_quota_usages function so
that the usages can be fetched for a specific project, as well as
removes the need for usage validation on creation of a new project.

Change-Id: I3ec84d14c8be7e3aae066119e963c4093f8aa345
Closes-Bug: 1380701
Merge "Pass correct project ID to get tenant_usages"