Bug 933113 - Modify Pair/Unpair interface for Gaia being able to Pair/Unpair with only BD address, r=gyeh, sr=mrbkap

NFC handover is a mechanism for two devices to exchange their Bluetooth device
address with each other. Then one device would be initialize the Bluetooth
pairing process with received Bluetooth device address. However currently we
need a BluetoothDevice object for Pairing/Unpairing, but actually the address
of the Bluetooth device object is the only thing Gecko requires.
Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/fcb4b4cde828
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #13729 from MBRSL/bug-938966-wifi

Bug 938966 - [UITest][HW test] WiFi test, r=gasolin

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https://hg.mozilla.org/integration/gaia-central/rev/75d517c4aa85
Author: Tom Jao <tjao@mozilla.com>
Desc: Bug 938966 - [UITest][HW test] WiFi test