[Merge] lp:~phablet-team/indicator-network/fix-for-turbo into lp:indicator-network

[Alfonso Sanchez-Beato]

"wifi.tethering.interface" is already present on MTK devices, we have not created that property. Which makes this much more easier.
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https://code.launchpad.net/~phablet-team/indicator-network/fix-for-turbo/+merge/290735
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