Provide .spec file for RPM building from tarball

[nkadel]

I've some functional files for RPM building over at https://github.com/nkadel/ansiblerepo/blob/master/ansible-5.x-srpm/ansible.spec

It would be reasonable straightforward to turn that into a .j2 file which would allow "rpmbuilt -ta" from the ansible tarball, if desired, and potentially support a "--redhat" option to go along with the "--debian" packaging option.