folder_branch_ops: locally finalize TLFs we can't read anymore (#694)
folder_branch_ops: locally finalize TLFs we can't read anymore (#694)

Issue: KBFS-1401
keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/kbfs,keybase/kbfs,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/kbfs,keybase/client