Support HostNetwork

[earthdiaosi]

What would you like to be added/modified:
Support HostNetwork

Why is this needed:
I have a kubeedge cluster. I want to use prometheus in the cloud to collect monitoring metrics for node_exporter at the edge.

1. prometheu and node_exporter are both deployed in Pods;
2. The IP address of prometheus is the container IP address, for example 100.16.0.2.
3. The IP address of node_exporter is the ip address of the host, for example 192.168.1.2.
4. There are more than 200 edge nodes, and the IP addresses of edge nodes may be repeated because they are in different Lans.

I've read all the documentation I can find, but still haven't solved this requirement.

1. https://edgemesh.netlify.app/
2. https://zhuanlan.zhihu.com/p/585749690
3. https://bbs.huaweicloud.com/blogs/420217

It seems fabedge already supports this feature, but I don't understand how it works.

1. https://github.com/FabEdge/fabedge

@Poorunga