mac: Fix network detection

[fvincenzo]

There air wifi networks that are not compatible with AirPort. In such a case the network.sh script does not detect correctly the SSID.

The message reported is:
"You are not associated with an AirPort network."

Fix the script detecting correctly the SSID of networks that do not support AirPort.

[ethancedwards8]

We actually have an existing PR #291 . Thank you, though.

[fvincenzo]

@ethancedwards8 Not a problem, happy to help. According to me PR #291 has a couple of problems in it's last iteration:

• Invokes ipconfig twice.
• If the network has airport support networksetup should be the preferred way to detect the SSID.
  Where should I put these comments?

[ethancedwards8]

@ethancedwards8 Not a problem, happy to help. According to me PR #291 has a couple of problems in it's last iteration:

* Invokes ipconfig twice.

That's a good point.

* If the network has airport support `networksetup` should be the preferred way to detect the SSID.
  Where should I put these comments?

I'm not sure I understand. Why is that preferable?

[fvincenzo]

I'm not sure I understand. Why is that preferable?

So that we have a fallback mechanism in place, if networksetup fails we fallback on ipconfig.

[ethancedwards8]

Thank you for your contribution.