[issue9523] Improve dbm modules

[Ray.Allen]

Ray.Allen <ysj.ray at gmail.com> added the comment:

Here is the updated patch, which fixed:

1. remove get() method of gdbm since issue6045 has already add it.

2. method keys() and items() of dbm object return set instead of list. Since pep3119 said keys() and items() should return collections.Set and set is a collections.Set.

3. add update() method to dbm object, which follows implementation in collections.MutableMapping.update().

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Added file: http://bugs.python.org/file19987/issue_9523.diff

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