*trivial* Remove unused flag 'force_stop_existing_persistent_connection'
Summary:
I'd recently checked in a flag concerning Persistent_soft vs Persistent_hard. At the time I'd misunderstood what work gets done pre-handoff, vs what work gets done after the handoff to the server. It turns out that the "force stop" issue must be done entirely after the handoff.
So this *handoff* flag 'force_stop_existing_persistent_connection' was in the wrong place. And it was never used in any case.
Reviewed By: arxanas
Differential Revision:
D5111111
fbshipit-source-id:
eb960c9c6a6d5d9ba590b7c4f6f00edd724264fc