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JIRA: VPP-498 Changes to build to help with downstream distro builds for Fedora, Centos and RHEL distros. Add nasm, automake, libtool, byacc, bison and flex. Remove libconfuse and dependencies. Remove epel-release rpm and dependencies. Add conditionals to work around Python 2 packaging inconsistency in Fed 25. Add numactl to rpm requirements. Change-Id: Ia39f8b931dc87e42df56414d38662eb33c7a4ca7 Signed-off-by: Thomas F Herbert <therbert@redhat.com>