[CHORE] Mordor testnet support

[ntallar]

Description

Configurations were taken from geth

• Bootstrap nodes: https://github.com/etclabscore/core-geth/blob/master/params/bootnodes_mordor.go
• Consensus configuration: https://github.com/etclabscore/core-geth/blob/master/params/config_mordor.go
• Genesis block: https://github.com/etclabscore/core-geth/blob/master/params/genesis_mordor.go

Differences in config with Geth

• Mantis has disabled EIP161 while Geth doesn't, as it's enabled by activating the Atlantis hard fork

Testing

Starting up Mantis with Mordor selected and syncing to the top of the chain

I already did that on my machine and successfully synced around 2.2 million blocks

[mirkoAlic]

LGTM!