Remove unused imports (PyChecker)
diff --git a/Lib/threading.py b/Lib/threading.py
index 74e93bb..0936e31 100644
--- a/Lib/threading.py
+++ b/Lib/threading.py
@@ -551,8 +551,6 @@
 
 def _test():
 
-    import random
-
     class BoundedQueue(_Verbose):
 
         def __init__(self, limit):
@@ -615,8 +613,6 @@
                 print item
                 self.count = self.count - 1
 
-    import time
-
     NP = 3
     QL = 4
     NI = 5