[releng] Don't catch exceptions while waiting for ADT to load
[releng] Wait for any ADT job to finish

AndroidMavenPluginTestCase's waitForAdtToLoad() is completely broken: it
will wait only for jobs that are:
- an instance of org.eclipse.core.runtime.jobs.Job
- job's class name contains
  'com.android.ide.eclipse.adt.internal.sdk.Sdk'

But this will never happen: com.android.ide.eclipse.adt.internal.sdk.Sdk
doesn't implement org.eclipse.core.runtime.jobs.Job .

Instead, wait for any jobs which class name starts with 'com.android.ide.eclipse.adt'.