Avoid Using Test Net Only Accounts

[mvandeberg]

I think as much of the custom aspects of the test net should be done using initminer as possible.

Porting transactions from the main net to the test net uses an account called porter, which is in use on the main net. The default testnet witness nodes are block-init-0:21. While I do not think the later are main net accounts, they could be. That behavior could cause issues with the startup scripts if the account had user data that somehow interfered with the bootstrapping process. I think it is better practice to using account names that we know Steemit controls, or those that are reserved in the protocol (such as initminer).