fix abigen to create pure/view methods

fix docker files to use bor instead of geth

MAT-869: Allow commitSpan/State actions if they are underpriced + Test commit span

* Delete vendor/ and switch to using go modules

* Add circleci config

Remove unwanted log

Develop

Dev span sprint api calls

check bor chain id for commit span and state

log usage standardised

MAT-494 verify block before validator set change at sprint end