Update config.rst
Update Makefile with new *final* specfile path
Correct RHEL python2_site* macros for virtualenv
update buildrequires for non-rhel
Update sitelib/sitearch definitions
Add pip install for prerequisites in rhel virtualenv context
relocate pip call
Update changelog
Merge pull request #271 from arista-eosplus/develop

Fix rpmbuild issues for rhel