stop leaving log.0000001 __db.00* and xxx.db turds in developer

sandboxes when bsddb3 tests are run.

Lib/bsddb/test/test_1413192.py

@@ -4,6 +4,8 @@
 # This test relies on the variable names, see the bug report for details.
 # The problem was that the env was deallocated prior to the txn.
 
+import shutil
+import tempfile
 try:
     # For Pythons w/distutils and add-on pybsddb
     from bsddb3 import db
@@ -11,7 +13,7 @@ except ImportError:
     # For Python >= 2.3 builtin bsddb distribution
     from bsddb import db
 
-env_name = '.'
+env_name = tempfile.mkdtemp()
 
 env = db.DBEnv()
 env.open(env_name, db.DB_CREATE | db.DB_INIT_TXN | db.DB_INIT_MPOOL)
@@ -19,3 +21,9 @@ the_txn = env.txn_begin()
 
 map = db.DB(env)
 map.open('xxx.db', "p", db.DB_HASH, db.DB_CREATE, 0666, txn=the_txn)
+
+# try not to leave a turd (won't help Windows since files are still open)
+try:
+    shutil.rmtree(env_name)
+except EnvironmentError:
+    pass