Check whether a port is occupied by another process before allocating it

[qiuwei68]

What would you like to be added:
When a port is allocated, it is considered whether the port is already occupied by a process on the host. If it is found to be occupied by a process on the host, the port is not selected
Why is this needed:
Increase port allocation robustness and success rate

[qiuwei68]

/assign @qiuwei68