disable speed and heading checks.

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bug 1090047: [MCTS] Geolocation: AssertError: Expected position.speed to be 'None' [See dependency tree for bug 1090047]
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Bug 1090047: [MCTS] Geolocation: AssertError: Expected position.speed to be 'None' [See dependency tree for bug 1090047]
add comment of disable speed and heading
Bug 1102111 - [MCTS] error on test webapi_tests.bluetooth.test_bluetooth_discovery.TestBluetoothDiscovery.test_discovering