Solution: Transfer vote to the election public key; generalize implemenation to handle election txn type
* Problem: Upsert valdiator 'new' doesn't accept public in base64 format
Solution: Tendermint stores all keys in base64 format so it would suitable to
abandon base58 encoding in favour of base64 encoding
* Problem: Not test for invalid execution of upsert-validator 'new'
Solution: Write tests to when invalid power or private key path has been supplied
* Problem: Exceptions are not informational when executing upsert-validator
Solution: generate error logs or print statement indicating success
* Problem: `run_upsert_validator_approve` was getting the voting power in a convoluted way
Solution: Changed it to get the voting power from the election outputs
* Problem: `run_upsert_validator_approve` casts votes for *all* voters, not just the user calling the command
Solution: Filter vote txs by the users public key
* Problem: Docs needed a more specific description of how to input the path to the private-key file
Solution: Changed the wording a bit
* Problem: Source files contain no license info
Solution: Add comments with SPDX license info to source files
* Python 3 files don't need # -*- coding: utf-8 -*-
* Problem: Need a method to initiate a new upsert-validator election
Solution: Added subcommand `new` to `upsert_validator`
* Problem: Changes to upsert-validator needed to be reflected in the docs
Solution: Wrote a section for `upsert-validator new`
* Problem: Docs for BEP#3 implementation not updated
Solutions: Update docs for #2070 and #2106
* Problem: 'Validator update' docs language not clear
Solution: Re-write the documentation which explains when validators are updated
* Problem: Typos and BEP reference missing
Solution: Fix typos and add BEP reference
* Document changes in the configure command.
Document new add/remove replicas commands.
* updated quickstart with mongodb instructions
* Docs on how to setup mongodb dev node with and without docker.
Update replSet option in docker-compose
* Fixed typo.
More explicit on how to run the tests.
* Fixed typo in mongodb docker instructions.
More explicit about requiring mongodb 3.4+
