Add a project to the flavor access list

def flavor_access_add(self, flavor_id, project_id):
        '''
        Add a project to the flavor access list
        '''
        nt_ks = self.compute_conn
        ret = {flavor_id: []}
        flavor_accesses = nt_ks.flavor_access.add_tenant_access(flavor_id, project_id)
        for project in flavor_accesses:
            ret[flavor_id].append(project.tenant_id)
        return ret