* it, it will request plugin to add the new flow. If the passed entry is
* not valid an error code is returned. If the existing flow is equal to the
* passed one it will be a no op and success code is returned.
* it, it will request plugin to add the new flow. If the passed entry is
* not valid an error code is returned. If the existing flow is equal to the
* passed one it will be a no op and success code is returned.