Reset should be allowed with pending childWF in current run, if current run is already closed

[longquanzheng]

cadence/service/history/reset/resetter.go

Line 643 in 1a50671

Message: "Can not reset workflow with pending child workflows",

This is because child WF could get get closed after parent closed, and parent will not receive the children close signals.

So that after parent is closed for any reasons(terminate/timeout/fail/etc), this parent is never allowed to reset to anywhere because it has a pending childWFs in its mutableState forever as "deadlock condition"