John L. Villalovos 8873f5eb91 Replace use of functools.wraps() with six.wraps()
In Python 2.7, functools.wraps() does not provide the '__wrapped__'
attribute. This attribute is used by
oslo_utils.reflection.get_signature() when getting the signature of a
function. If a function is decorated without the '__wrapped__'
attribute then the signature will be of the decorator rather than the
underlying function.

From the six documentation for six.wraps():
    This is exactly the functools.wraps() decorator, but it sets the
    __wrapped__ attribute on what it decorates as functools.wraps()
    does on Python versions after 3.2.

Change-Id: Ic0f7a6be9bc3e474a0229b264d1bfe6c8f7e6d85
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