[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/benchmarks/benchmark_unittest.py

Index: tools/perf/benchmarks/benchmark_unittest.py
diff --git a/tools/perf/benchmarks/benchmark_unittest.py b/tools/perf/benchmarks/benchmark_unittest.py
index 1b6cc106821ef7da32d2222845a901e237a0575e..6d900ce207194ff441289e815805e7b230f94e10 100644
--- a/tools/perf/benchmarks/benchmark_unittest.py
+++ b/tools/perf/benchmarks/benchmark_unittest.py
@@ -4,10 +4,10 @@
 
 """For all the benchmarks that set options, test that the options are valid."""
 
+from collections import defaultdict
 import logging
 import os
 import unittest
-from collections import defaultdict
 
 from telemetry import benchmark as benchmark_module
 from telemetry.core import browser_options