Patch for concurrent iterator & others (onto v1.11.6) #386

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roysc wants to merge 1565 commits from v1.11.6-statediff-v5 into master
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@ -170,7 +170,7 @@ func (api *PrivateAdminAPI) ExportChain(file string, first *uint64, last *uint64
last = &head
}
if _, err := os.Stat(file); err == nil {
// File already exists. Allowing overwrite could be a DoS vecotor,
// File already exists. Allowing overwrite could be a DoS vector,
// since the 'file' may point to arbitrary paths on the drive
return false, errors.New("location would overwrite an existing file")
}