add python-setuptools to requires

Commit 9f049ca144 introduced dependency on
python-setuptools on line:
  from pkg_resources import parse_version

This dependency is missing on minimal installation and then ipa-server-upgrade
fails on rpm install/upgrade.

Reviewed-By: Martin Basti <mbasti@redhat.com>

freeipa.spec.in

@@ -305,6 +305,7 @@ Requires: python-sss-murmur
 %endif
 Requires: wget
 Requires: dbus-python
+Requires: python-setuptools
 
 Conflicts: %{alt_name}-python
 Obsoletes: %{alt_name}-python < %{version}