Fix the #connected_network_name method by using networksetup

[arnlen]

The MacOsModel#connected_network_name method is broken since it's using the now removed airport utility (see this issue).

A workaround is to use the networksetup tool.

Without this PR

The output of the command is always nil.

irb(main)> WifiWand::MacOsModel.new.connected_network_name
=> nil

With this PR

It properly returns the connected network name. ✅

irb(main)> WifiWand::MacOsModel.new.connected_network_name
=> Pattara211

[keithrbennett]

@arnlen Thank you for this! I have been meaning to get around to dealing with Apple's changes but hadn't had a chance yet. I want to maintain compatibility with older versions of the OS so I will look at testing to see if airport is available and then branching to your code if not. Give me a couple/few days to take a look at all this and I will get back to you.

[keithrbennett]

@arnlen Thanks for the PR. I happened to have a network name that had a space in it and noticed that this would only include the last word of the name. I merged your PR but added a fix and simplified it somewhat. Also, I changed the test for 'connected' to be to search for the presence of ''Current Wi-Fi Network: ' rather than the absence of 'not associated' to be a tiny bit safer, for example if error messages were internationalized but success messages were not, or if the network name happened to contain 'not associated' (which is admittedly farfetched but not impossible). Here is the diff from your PR to the current head:

[keithrbennett]

@arnlen Now that you are a contributor to this project, I need your ok to change the project's license. I'd like to change it from MIT to Apache 2. Is this ok with you?