refs #5793 - distribute VERSION

https://github.com/theforeman/smart-proxy/commit/9f019d1e3ba033d892ffe4e29b871d3f1dc74437 introduces a dependency on this file.

Scratches: http://ci.theforeman.org/job/packaging_build_deb_coreproject/727/ seem to contain the /usr/share/foreman-proxy/VERSION file

Please kick http://ci.theforeman.org/job/test_proxy_develop/ when merged, which'll build new RPMs and debs.