engine: test: Pass in the go test verbose flag

This hooks up our debug variable to the go test verbose flag.

engine/resources/exec_test.go

@@ -24,7 +24,7 @@ import (
 )
 
 func fakeInit(t *testing.T) *engine.Init {
-	debug := true
+	debug := testing.Verbose() // set via the -test.v flag to `go test`
 	logf := func(format string, v ...interface{}) {
 		t.Logf("test: "+format, v...)
 	}