[feature] Added support for more WPA EAP client parameters #313

[pandafy]

Checklist

• I have read the OpenWISP Contributing Guidelines.
• I have manually tested the changes proposed in this pull request.
• I have written new test cases for new code and/or updated existing tests for changes to existing code.
• I have updated the documentation.

Reference to Existing Issue

Closes #313

[coveralls]

coverage: 99.191%. remained the same
when pulling a7c922f on issues/297-wiregaurd-docs
into 3617699 on master.

[nemesifier]

Docs are missing here.

[pandafy]

I don't see a table explaining the WPA client parameters
Shall I add the options here in the example?

https://netjsonconfig.openwisp.org/en/latest/backends/openwrt.html#wpa2-enterprise-802-1x-client

[nemesifier]

I don't see a table explaining the WPA client parameters Shall I add the options here in the example?

https://netjsonconfig.openwisp.org/en/latest/backends/openwrt.html#wpa2-enterprise-802-1x-client

Yes please.