DO NOT MERGE: cherry-pick https://review.source.android.com/14536 into tools_r6.

DO NOT MERGE: cherry-pick https://review.source.android.com/14536 into tools_r6.

Original commit message:
------------
Attempt to fix intermittent ADT test run failures.

Change the ADT test run steps to be more deterministic:
1) Start the JDT test run listener server side connection before the client
side (this is invokked via the launch.addProcess call)
2) Don't fork off a separate thread to run the tests. This was always
redundant and inefficient anyway, since the AndroidLaunchController already
forks off a thread to perform the launch

Bug 7976

Change-Id: Ie237e7d83e1f5a945a2061506b7c302c04aef8d0