mod: Introduce project_property_schema
mod: Introduce project_property_schema

The new member of module instance defines the schema of the module's
per-project configuration. It is configured in the project details page
if the user is logged in and has permission to.

Signed-off-by: Fam Zheng <df9fd617995bad07eac70e27aa3fe5069270e3bd@redhat.com>

pvital/patchew,pvital/patchew,pvital/patchew,pvital/patchew