Parametrize start/end block ranges for all tests

[Termina1]

Is your feature request related to a problem? Please describe.
flood is good for testing eth, however its not very easy to test other networks, because it hardcodes block ranges for which it generates requests.

Describe the solution you'd like
Parametrize block ranges for tests (start/end block number)

[jbuice]

I second this one. Telos for example deployed their EVM at block 180698860 and there are no EVM transactions before that.