Problem raised on macOS where port 49152 was used by rapportd process
listening on 0.0.0.0 address and as a consequence the application proxy
server wasn't correctly setup that in turn disrupted the webview display
that wasn't served through http://<uid>.localhost:49152/ (#255)
Indeed the checkPort() function was checking port availability using the
127.0.0.1 address that doesn't error.
The minimal fix here is to test port availability using 0.0.0.0 address.
Signed-off-by: Alexis Deruelle <alexis.deruelle@gmail.com>
