fix: change the port ID definition in kubernetes.go file

[AhmedGrati]

Problem

Fix this issue. The problem was mainly, in the ID of each port.
In the previous implementation, the ID was composed of the ASCII code of the port number and its protocol. However, such implementation led to some inconveniences for the large port numbers. In fact, If you try this command fmt.Println(string(55546) == string(55547)) it will print true, which is not the desired behavior and it's the main cause behind the issue.

Solution

To overcome this issue, I just replaced the string() function with strconv.Itoa(). I added large close numbers in the tests suite, to ensure that we get the desired behavior.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

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[cdrage]

LGTM!