Added bad addresses to getpeers RPC endpoint

[dethos]

What current issue(s) does this address, or what feature is it adding?
This pull request completes the getpeers RPC functionality. At the time of the implementation, neo-python didn't track bad peers so it wasn't able to provide that information, since then that functionality was added so we must update the RPC method.

How did you solve this problem?
Added bad peers based on the DEAD_ADDRS list on the NodeLeader.

How did you make sure your solution works?
Updated the getpeers test

Are there any special changes in the code that we should be aware of?
No

Please check the following, if applicable:

• Did you add any tests?
• Did you run make lint?
• Did you run make test?
• Are you making a PR to a feature branch or development rather than master?
• Did you add an entry to CHANGELOG.rst? (if not, please do)

[coveralls]

Coverage increased (+0.006%) to 83.02% when pulling 5ea3fcb on dethos:update-getpeers-rpc into f8c03ba on CityOfZion:development.

[jseagrave21]

Nice!

[ixje]

Thanks!