Create local instance with local image

- Prepare the launch_cvd cmd and check the required enviornment.
- Create local instance via launch_cvd cmd and wait for boot up.
- Launch vnc client after AVD boot up.

Bug: 111162251
Test: m acloud && atest acloud_test &&
acloud create --local_instance --local_image -vv
Change-Id: I73461b023c444c1ebb29818eef4475bbf86a4200
10 files changed