Network transform: custom service names in "AddService" operation

[eranra]

In AddService we add the network service name by protocol and port. The code is currently using the common http://godoc.org/honnef.co/go/netdb library that used behind the scenes names from the file /etc/protocols. It is required that we will be able to use an alternate list of services. Preferable to read a custom file in the same format allowing users to use a different set of services names.

https://github.com/netobserv/flowlogs2metrics/blob/ecfe88cfc766de7b509dbfac645ab00d26f3263c/pkg/pipeline/transform/transform_network.go#L125

[eranra]

@KathyBarabash we might need that for IBM only. The current RH solution translates names at the front-end (UI) level.
@jotak FYI