Fix regression issues with cells target filter

1) Skip scheduling if a cell filter already took care of it
2) Call build_instances or schedule_run_instance (deprecated) depending on
   which method the caller used.

bug 1224465

Change-Id: I391e1c4f288c9dc3e1308ee8c001a662e0f4c1b8
Merge "Fix regression issues with cells target filter"