Implement etcd lifecycle management for vineyardd

[dashanji]

What do these changes do?

• Add the etcdctl cmd flag.
• Launch an etcd instance when start a vineyardd instance.
• Remove the related etcd member when a vineyardd instance exit.

Related issue number

Fixes https://github.com/v6d-io/v6d/issues/1922

[dashanji]

Please add a test suite to ensure it works.

Okay.