The oslo_utils.fnmatch module was added to solve an issue in py2.7 but
it is no longer required because py2.7 is no longer supported.
The module was deprecated since oslo.utils 4.9.1[1] and the stdlib's
fnmatch module should be used instead.
[1] 4c893c92f551c9dd2a7cfbe7ae8171ad8139df0b
Change-Id: Ibae52796df829f151c3088026a326deaf859bd44