Add ability to have device-name based options

It is sometimes useful to add additional options in run-test for
sepecific devices. This CL adds the ability to do that using the value
of the 'ro.product.name' property. It uses this to reduce Xmx for fugu
devices.

Test: Manual
Test: ./test/testrunner/testrunner.py --target -t 001-HelloWorld
Bug: 67649705
Change-Id: Ie4fff410bdd74bb5cbf0f1e64e0776cfd6ce1eca