hacking: Fix false positive in C302 check
hacking: Fix false positive in C302 check

Use a regular expression to search for "unicode(" instead of a static
string to not complain to "exception_to_unicode(error)".

Change-Id: I0a969b184054f287cef463bbcb980bfb4a0a6803

ge0rgi/cinder,mahak/cinder,Hybrid-Cloud/cinder,mahak/cinder,j-griffith/cinder,Nexenta/cinder,eharney/cinder,cloudbase/cinder,phenoxim/cinder,dims/cinder,NetApp/cinder,cloudbase/cinder,Nexenta/cinder,openstack/cinder,phenoxim/cinder,bswartz/cinder,NetApp/cinder,j-griffith/cinder,Datera/cinder,eharney/cinder,Datera/cinder,openstack/cinder,dims/cinder,Hybrid-Cloud/cinder,bswartz/cinder