private/testplanet: add option to run testplanet databases non-parallel

NonParallel running is needed for gateway tests, because minio
unfortunately relies on global state.

Change-Id: If730db2ab86d10f4d02e1ac3128f758e9c18cdff

private/testplanet/planet.go

@@ -52,7 +52,8 @@ type Config struct {
 	IdentityVersion *storj.IDVersion
 	Reconfigure     Reconfigure
 
-	Name string
+	Name        string
+	NonParallel bool
 }
 
 // Planet is a full storj system setup.

private/testplanet/run.go

@@ -20,7 +20,10 @@ func Run(t *testing.T, config Config, test func(t *testing.T, ctx *testcontext.C
 	for _, satelliteDB := range satellitedbtest.Databases() {
 		satelliteDB := satelliteDB
 		t.Run(satelliteDB.MasterDB.Name, func(t *testing.T) {
-			t.Parallel()
+			parallel := !config.NonParallel
+			if parallel {
+				t.Parallel()
+			}
 
 			ctx := testcontext.New(t)
 			defer ctx.Cleanup()