Use prefix naming for attach tests

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>

integration-cli/docker_cli_attach_test.go

@@ -11,7 +11,7 @@ import (
 
 const attachWait = 5 * time.Second
 
-func TestMultipleAttachRestart(t *testing.T) {
+func TestAttachMultipleAndRestart(t *testing.T) {
 	defer deleteAllContainers()
 
 	endGroup := &sync.WaitGroup{}