* Fix chronos related deprecated warnings in discv5
* Fix chronos related deprecated warnings in uTP code
* Improve discv5 closeWait order of events and add noCancel
`dcli` got moved and the guide is no longer accurate. Update the paths.
Also, relative imports were incorret inside `dcli.nim`, and error when
using Nim 2.0 compiler.
`parseCmdArg` is expected to raise `ValueError` but for `enr.Record`,
`Node`, `PrivateKey`, and `NatConfig`, we raise `ConfigurationError`.
Change to `ValueError` instead.