Refactor ApfFilter creation

This patch introduces a helper ApfConfiguration class for passing filter
parameters to the constructor of ApfFilter. The benefits are:
  - less parameter boilerplate across IpManager, ApfFilter, ApfTest
  - easier to add more parameters in the future (useful for hardware
    counters options and further gservices configurable options)

There is no functional changes otherwise.

Test: runtest frameworks-net
Change-Id: I47231c21df80bc36b6d4e15369748017b50b8da1