Fix issue where container IP is occasionally empty for Kubernetes pods in HostNetwork mode (#1280)

This patch addresses a problem where the hostname specified in the hostname file does not match the entry in the etc-hosts file when using Kubernetes HostNetwork mode. The mismatch leads to scenarios where the container IP is retrieved as empty. 

To resolve this issue, the fix implements a check to compare the container's hostname against the daemon's hostname when HostNetwork mode is enabled. If they are identical, the container will inherit the daemon's IP address, ensuring consistency and preventing the container's IP from being empty.

This adjustment ensures reliable IP address assignment and mitigates the risk of networking issues within the Kubernetes cluster.

Author: EvanLjp

pkg/helper/docker_center.go

@@ -476,6 +476,9 @@ func getIPByHosts(hostFileName, hostname string) string {
 			return util.ReadFirstBlock(line)
 		}
 	}
+	if util.GetHostName() == hostname {
+		return util.GetIPAddress()
+	}
 	return ""
 }