API returns project/user/trust ids without dashes

Added a new parameter to the UuidType used by the V2 API. The idea of
this parameter is to configure if the UUID will be returned
with or without dashes.

Change-Id: I7bbc213ed8effa568df2ab0a83b579bfb7c79a23
Closes-Bug: #1306622
Merge "API returns project/user/trust ids without dashes"