EIP-1014 CREATE2

Documentation for tests/constantinople/eip1014_create2@206854b5.

Generate fixtures for these test cases for Prague with:

fill -v tests/constantinople/eip1014_create2 --fork Prague

abstract: Test EIP-1014: Skinny CREATE2

Tests for  [EIP-1014: Skinny CREATE2](https://eips.ethereum.org/EIPS/eip-1014).