Use python3 explicitly for building source
Use python3 explicitly for building source

The source distrobution on CentOS7 does not work well
with python2.  Using python3 to build the dist for python2
and python3 fixes issues with extra data being missed in
packaging.

xcat2/confluent,jjohnson42/confluent,xcat2/confluent,xcat2/confluent,xcat2/confluent,jjohnson42/confluent,jjohnson42/confluent,jjohnson42/confluent,jjohnson42/confluent,xcat2/confluent