build: add python-devel (v2) explicitly for el7 vagrants
build: add python-devel (v2) explicitly for el7 vagrants

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp