Fixed to the point that all unit tests pass again.  (However, I get 4
"exception in thread" messages, one about a killed locker, and three
assertions.)  Details:

test/test_dbshelve.py:
- kill reference to InstanceType

test/test_basics.py:
- use // for int division
- use 'in' instead of has_key

dbshelve.py:
- fix bug in previous has_key fix, use self.db.has_key instead of self.has_key

dbtables.py:
- use 'in' instead of has_key

dbutils.py:
- fix bug in previous has_key fix, test for 'max_retries', not 'max_tries'
diff --git a/Lib/bsddb/dbutils.py b/Lib/bsddb/dbutils.py
index 0c4c1cb..daec873 100644
--- a/Lib/bsddb/dbutils.py
+++ b/Lib/bsddb/dbutils.py
@@ -55,7 +55,7 @@
     """
     sleeptime = _deadlock_MinSleepTime
     max_retries = _kwargs.get('max_retries', -1)
-    if 'max_tries' in _kwargs:
+    if 'max_retries' in _kwargs:
         del _kwargs['max_retries']
     while True:
         try: