This reverts commit 81553263ab.
This fixes a regression with Windows port detection which led to port
collisions not being fixed on `vagrant up`.
PR #8517 changed `IsPortOpen#is_port_open?` to rescue
Errno::EADDRNOTAVAIL, but when we merged it into master, there was code
in `HandleForwardedPortCollisions#port_check` that depended on that
error bubbling up.
This also changes the port number in the HandleForwardedPortCollisions
tests to be a less common port number -- some of these tests will fail
if there is a local process running on port 8080.