Update tests to match new changes in GoQuorum with Geth v1.9.19

[ricardolyn]

Note: this PR will have to be merged with a RED pipeline as the necessary changes on GraphQL arguments are not yet merged in GoQuorum repo. Tests with basic tags will be the ones failing in the GraphQL step

Changes

• Remove graphql arguments for port, etc; as now they are the same as the rpc/http arguments (it runs in the same port/host).
• Fix issue with deleting data directory. The problem is that the datadir is deleted while get is still running and only after it, the service is shutdown. However, a new change of 1.9.19 does a cache file of the freeze db while stopping the blockchain service, which then creates the folder again. The solution is to check if genesis.json file is there instead of the folder itself (as it might be the folder with this cached db).
• Add improvements on Istanbul validator management test to remove flakiness in some runs when block is not right.
• Fixed graphql tests as they had the wrong tags and then not running as part of ATs. Moved to be a basic test as is not doing anything advanced.

The approach datadir deleting should be reviewed in the future to only be done after the geth process stops

References

• Upgrade geth upstream 1.9.19 PR on GoQuorum: [Upgrade] Go-Ethereum release v1.9.19 quorum#1146
• Pipeline with GoQuorum geth v1.9.19 image: https://github.com/ConsenSys/quorum-acceptance-tests/actions/runs/632196572

[nmvalera]

LGTM

[trung]

LSGTM