Remove the python2 subpackage from Fedora and RHEL > 7 as well as fix the tutorial build.

[Charalampos Stratakis]

Originating PR downstream: https://src.fedoraproject.org/rpms/systemtap/pull-request/3#

-- 
Regards,

Charalampos Stratakis
Software Engineer
Python Maintenance Team, Red Hat
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