Coova-chilli: Adding Menu option for enabling chilli proxy.

Chilli proxy is used when one does not want to setup AAA server
but want to handle AAA through http.

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Signed-off-by: Ramanathan Sivagurunathan ramzthecoder@gmail.com
Merge pull request #592 from ageekymonk/chilli_proxy

coova-chilli: adding menuconfig option for enabling chilli proxy