Rename review-period-end to last-call-end or last-call-deadline

[axic]

It is confusing when the Review state doesn't require it, but the Last Call state does. It should have been changed when the Review state (at last) was introduced.

[axic]

cc @MicahZoltu @lightclient

[axic]

@alita-moore I know there's an issue about the bot pestering incorrectly, but now it also shows the \n\n newline characters are not properly handled.

[alita-moore]

Weird, okay. I'll append that to the ticket. Btw issues are more likely to be solved if you mention them in the eth-bot repo. Just because it's easier for me to organize

[MicahZoltu]

We discussed this on the EIPIP call, everyone is OK with this change, and either last-call-end or last-call-deadline are acceptable. Whoever opens a PR to make this change gets to pick teh name to use. 😀

[axic]

Started doing this, depends on ethereum/eipv#35 now.