Fix infinitely reschedule instance due to miss retry info

The logic of building instance is moved from scheduler to conductor,
But 'retry' info is still populated at scheduler manager, and that
can't be take back from rpc call. This patch moves the retry checking
logic into conductor, and keep the old 'schedule_run_instance'
same as before.

Change-Id: I4efafe815e8623881e6c037eb9d04c0dbb7052a2
Partial-Bug: #1326207
Merge "Fix infinitely reschedule instance due to miss retry info"