Use eth-tester to perform tests

[ankitchiplunkar]

Is your feature request related to a problem? Please describe.
The current tests for parity need it running in tracing mode with block_number > 60000. This means we need to configure a running instance of parity each time we need to perform parity tests.

Describe the solution you'd like
Need to use https://github.com/ethereum/eth-tester to perform local tests,
We can replace the Infura tests by connecting to the local node using HTTPProvider.
The test fictures can be inspired from https://github.com/ethereum/web3.py/tree/master/tests/integration