Update smoke test for moved bin-test scripts

Traceback (most recent call last):
  File "dev-tools/scripts/smokeTestRelease.py", line 1152, in <module>
    main()
  File "dev-tools/scripts/smokeTestRelease.py", line 1081, in main
    smokeTest(c.java, c.url, c.revision, c.version, c.tmp_dir, c.is_signed, c.local_keys, ' '.join(c.test_args),
  File "dev-tools/scripts/smokeTestRelease.py", line 1140, in smokeTest
    unpackAndVerify(java, tmpDir, 'solr-%s-src.tgz' % version, gitRevision, version, testArgs)
  File "dev-tools/scripts/smokeTestRelease.py", line 540, in unpackAndVerify
    verifyUnpacked(java, artifact, unpackPath, gitRevision, version, testArgs)
  File "dev-tools/scripts/smokeTestRelease.py", line 598, in verifyUnpacked
    is_in_list(in_solr_folder, expected_src_solr_folders)
  File "dev-tools/scripts/smokeTestRelease.py", line 555, in is_in_list
    raise RuntimeError('file "%s" is missing' % file_name)
RuntimeError: file "bin-test" is missing