Fix the device selection failure

If the adb server was not started yet, the output from adb devices would
contain the adb start log, which caused device selection failure
when single device attached. This change fixes that

Change-Id: If4f15729aa9bb2b3f5ae8d49cf77089079c4b2f0

android/scripts/gfxrecon.py

@@ -59,7 +59,8 @@ class DeviceSelectionException(Exception):
     pass
 
 def QueryAvailableDevices():
-    devices = subprocess.getoutput(adb_devices).splitlines()[1:]
+    result = subprocess.run(shlex.split(adb_devices, posix='win' not in sys.platform), capture_output=True, check=True)
+    devices = result.stdout.decode().strip().splitlines()[1:]
     return [device.split('\t')[0] for device in devices]
 
 def CheckDeviceSelection():