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Port forwarding in Cros will allow users to add, activate, remove and
deactivate ports.

This CL includes the implementation of the remove and deactivate port
utilities and unit tests.

The tracking of the port forwarding preferences in the user's profile
preferences has not been implemented yet.

Bug: chromium:848127
Test: crostini_port_forwarder_unittest.cc and everything builds
Change-Id: Ie7b5358813ca9cf454e0e216467c6d1ec8344c08
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015868Reviewed-by: Fergus Dall <sidereal@google.com>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Commit-Queue: Matthew Chen <matterchen@google.com>
Cr-Commit-Position: refs/heads/master@{#736249}