Make RPC bind to localhost by default (#3746)
* Make RPC bind to localhost by default
* Add CHANGELOG_PENDING entry
* Allow testnet command to override RPC listen address
* Update localnet test to bind RPC to 0.0.0.0
* Update p2p test to bind RPC to 0.0.0.0
* Remove rpc-laddr parameter
* Update localnet to use config template with RPC listen address override
* Use config template override method for RPC listen address
* Build config template into localnode image
* Build localnode image locally before starting localnet
* Move testnet config overrides into templates
* Revert deletion of config overrides
* Remove extraneous config parameter overrides
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