Clean up test suite (#134)

This attempts to simplify tests, and make them generally more usable:
- simplifies CI jobs
- makefile tweaks, init.sh clean up
- small dockerfile, compose, etc. improvements
- removes sdk-tester dockerfile, the sdk repo has it
- removes redundant test scripts, improve run-tests
- simplifies and removes redundant logic in test suite. covers ignored errors
- adds logging context, doc updates

Co-authored-by: Roy Crihfield <roy@manteia.ltd>
Co-authored-by: Prathamesh Musale <prathamesh.musale0@gmail.com>
Reviewed-on: cerc-io/laconicd#134
Reviewed-by: Thomas E Lackey <telackey@noreply.git.vdb.to>
Co-authored-by: Prathamesh Musale <prathamesh@noreply.git.vdb.to>
Co-committed-by: Prathamesh Musale <prathamesh@noreply.git.vdb.to>

testutil/network/network.go

@@ -519,6 +519,7 @@ func New(l Logger, baseDir string, cfg Config) (*Network, error) {
 
 	l.Log("starting test network...")
 	for _, v := range network.Validators {
+		l.Log("starting validator:", v.Moniker)
 		err := startInProcess(cfg, v)
 		if err != nil {
 			return nil, err