Consolidate network testing code

[evan-forbes]

With the introduction of our own network tests, we should replace our usage of the old cosmos-sdk network tests for our integration tests.

This will involve:

• Adding cli execution functionality for the new testnode
• Refactor existing integration tests to use new testnode

we should also expect a decrease in integration test times, since the new testnode can produce sub 1s blocks.

[rootulp]

Resolving this issue will likely also resolve #574

[rahulghangas]

Picking this up

[evan-forbes]

in #1474, we are introducing the ibctesting framework for testing the ibc token filter. This seems like a good solution imo considering the amount of work we'd have to do replicate the same functionality. However, I'll ref it here to have a more exhaustive list

[rootulp]

I think the original post refers to the two test networks:
A.

celestia-app/test/util/network/network.go

Line 27 in be3acf0

func New(t *testing.T, config network.Config, genAccNames ...string) *network.Network {

B.

celestia-app/test/util/testnode/full_node.go

Line 69 in be3acf0

func NewNetwork(t testing.TB, cfg *Config) (cctx Context, rpcAddr, grpcAddr string) {

where A should be deleted and usage of A should be replaced with B.