Fixed wifimanager to handle single quotes

[Jason Heard]

I found that I could not connect to my wireless network with the Omega2+. My SSID is Shadow's Wireless IV. I investigated how the wifimanager script works and the problem is that it uses xargs (which cannot handle the ' character) and uci show rather than uci get (which have the same problem with ' and is also used for the password).

I've fixed wifimanager by removing these issues. I would request that the next firmware update include a script that can handle more special characters. (Either this version or another fixed version.) I don't have permissions to upload a file, so I have provided a copy here.

[Keitaro]

@administrators look at this :)!

[Jeremy Shubert]

@administrators Please!? It's been over a year since this problem and a proposed solution have been pointed out.

[Lazar Demin]

@Jeremy-Shubert
Which firmware are you running? In the latest builds (b176 and up) we've done an overhaul of the wifi driver and the wifisetup script. You can install the latest firmware by running oupgrade --latest

Also, everyone who identifies and tests fixes for code is welcome and encouraged to fork our repos on GitHub and submit pull requests.
Here's where you can find the wifisetup script: https://github.com/OnionIoT/OpenWRT-Packages/blob/master/wifi-warp-core/bin/wifi-setup.sh