Bluetooth SDP autotest: Bluetooth Tester to support Service Search Attribute

This CL adds Service Search Attribute Request method to BluetoothTester and
BluetoothTesterXmlRpcDelegate classes.

BUG=chromium:416168
TEST=pylint; use methods on stumpy and peppy

Change-Id: Idb8adfe35424c9697fab5ed9dd72c704da56f272
Reviewed-on: https://chromium-review.googlesource.com/219886
Tested-by: Artem Rakhov <arakhov@chromium.org>
Reviewed-by: Michael Janssen <jamuraa@chromium.org>
Reviewed-by: Arman Uguray <armansito@chromium.org>
Commit-Queue: Artem Rakhov <arakhov@chromium.org>
2 files changed