Companion for EPM duplicate submissions (#6115)

* make it work

* add migration

* fix

* Update utils/staking-miner/src/opts.rs

Co-authored-by: Niklas Adolfsson <[email protected]>

* Update utils/staking-miner/src/monitor.rs

* small tweaks

* Update utils/staking-miner/src/opts.rs

Co-authored-by: Bastian Köcher <[email protected]>

* fmt

* fix print'

* fmt

* update lockfile for {"substrate"}

Co-authored-by: Niklas Adolfsson <[email protected]>
Co-authored-by: Bastian Köcher <[email protected]>
Co-authored-by: parity-processbot <>