Squash-merged on request.
* Dogecoin address prefixes
* Use "doge" for BECH32 addresses
* Switch Bitcoin references to Dogecoin in Travis
* Update addresses in dogecoin-tx tests
* Use "doge" for BECH32 addresses
* Remove functional tests which do not apply to Dogecoin (backwards compatibility tests do not have suitable clients to test against)
- Get rid of hardcoded wallet "" names and -wallet="" args
- Get rid of setup_nodes (-wallet, -nowallet, -disablewallet) argument rewriting
Motivation:
- Simplify test framework behavior so it's easier to write new tests without
having arguments mangled by the framework
- Make tests more readable, replacing unexplained "" string literals with
default_wallet_name references
- Make it trivial to update default wallet name and wallet data filename for
sqlite #19077 testing
- Stop relying on -wallet arguments to create wallets, so it is easy to change
-wallet option in the future to only load existing wallets not create new
ones (to avoid accidental wallet creation, and encourage use of wallet
encryption and descriptor features)