* stable-2.16: ListChildProjects: Make settting recursive option chainable ListChildProjects: Add limit option ListChildProjects: Use parent predicate to find child projects QueryProjects: Make setter methods chainable Project index: Add parent predicate ListChildProjectsIT#listChildrenWithLimit is adjusted to use the ProjectOperations interface. Change-Id: I185c204f6acbf542f7d80454fe67ce892147473a