[run-functional-tests feature] to add more nodes without restart the existing running nodes

[zzhou1]

Imaging the use case to add 10 more nodes to the existing 20 running nodes, it is not very good to restart them.

Changed as docker run --restart always, and run crm cluster enable before running crm cluster start
So after rebooted, the containers will started, too

Originally posted by @liangxin1300 in #957 (comment)

[liangxin1300]

See #1235