ADT test fixes.

Temporarily remove SampleProjectTest from continuous, since its failing at
every CL.
Adjust ApiDemosRenderingTest to use the SDK loaded by ADT.
Remove SdkEnvTestCase since it doesn't work in all situations.
Fix test data lookup for NinePatchTest and BridgeXmlBlockParserTest.

Bugs 2222616, 2218682
12 files changed