Fix conditional for Python 2 subpackage

It's only needed for EPEL 6 and 7. It was also triggering for ELN, which
caused build failures.

python-productmd.spec

@@ -1,7 +1,7 @@
-%if 0%{?fedora} >= 31
-%bcond_with python2
-%else
+%if 0%{?rhel} && 0%{?rhel} <= 7
 %bcond_without python2
+%else
+%bcond_with python2
 %endif
 %bcond_without  python3
 
@@ -9,7 +9,7 @@
 
 Name:           python-%{srcname}
 Version:        1.28
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Library providing parsers for metadata related to OS installation
 
 License:        LGPLv2+
@@ -102,6 +102,9 @@ Requires:       python%{python3_pkgversion}-six
 %endif
 
 %changelog
+* Tue Sep 29 2020 Lubomír Sedlář <lsedlar@redhat.com> - 1.28-2
+- Fix Python 2 conditional for ELN
+
 * Fri Sep 25 2020 Lubomír Sedlář <lsedlar@redhat.com> - 1.28-1
 - New upstream release