Fix the naming convention problem for python-setuptools.

Fix the naming convention problem for python-setuptools.

There is no python2-setuptools.rpm for any of rhel{6,7}.

EPEL6 has python2-setuptools.rpm, but it merely is a dummy wrapper
for python-setuptools.rpm.  ATM, there is no other reason to use EPEL
on RHEL than this, so it's better to avoid it entirely.  RHEL7
depsolver can pair python-setuptools.rpm with python2-setuptools.rpm
via Provides, but there is no python2-setuptools.rpm for RHEL7
either.  But Fedora does have python2-setuptools.rpm.