db-api-review: wrap.func_name appears unused, but isn't

[Mark McLoughlin]

See https://review.openstack.org/21166

It looks like this:

def wrap_db_error(f):
    def _wrap(*args, **kwargs):
        ...
    _wrap.func_name = f.func_name
    return _wrap

is unused

But it's probably a trick to make a traceback of an exception thrown from _wrap() look like it was thrown from the wrapped function

Somebody figure out wtf is going on here and add a comment :)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/42843

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/42843
Committed: http://github.com/openstack/oslo-incubator/commit/347f29e3f0a4012ae6b517ba8119ec8f0f6cd97f
Submitter: Jenkins
Branch: master

commit 347f29e3f0a4012ae6b517ba8119ec8f0f6cd97f
Author: Boris Pavlovic <email address hidden>
Date: Tue Aug 20 13:17:43 2013 +0400

    Use functools.wrap() instead of custom implementation

    In openstack.db.sqlalchemy.session.py:_wrap_db_err() we used
    custom implementation of functools.wrap(). So this patch remove
    custom implementation and use functools.wrap().

    Closes-Bug: #1119726

    Change-Id: Ic92658647bc37d81a819581128fec675ad545c4a