some test suite cleanup, use tempfile.mkdtemp() in setUp and

shutil.rmtree() in tearDown().  add missing tests to the list
in the test_bsddb3 suite.

Lib/bsddb/test/test_cursor_pget_bug.py

@@ -1,5 +1,7 @@
 import unittest
 import sys, os, glob
+import shutil
+import tempfile
 
 from bsddb import db
 
@@ -11,11 +13,7 @@ class pget_bugTestCase(unittest.TestCase):
     db_name = 'test-cursor_pget.db'
 
     def setUp(self):
-        self.homeDir = os.path.join(os.path.dirname(sys.argv[0]), 'db_home')
-        try:
-            os.mkdir(self.homeDir)
-        except os.error:
-            pass
+        self.homeDir = tempfile.mkdtemp()
         self.env = db.DBEnv()
         self.env.open(self.homeDir, db.DB_CREATE | db.DB_INIT_MPOOL)
         self.primary_db = db.DB(self.env)
@@ -36,9 +34,7 @@ def tearDown(self):
         del self.secondary_db
         del self.primary_db
         del self.env
-        for file in glob.glob(os.path.join(self.homeDir, '*')):
-            os.remove(file)
-        os.removedirs(self.homeDir)
+        shutil.rmtree(self.homeDir)
 
     def test_pget(self):
         cursor = self.secondary_db.cursor()