Fedora version of systemd macros does not work correctly on CentOS7, since CentOS7 does not support "file trigger" feature. Even after 05d4378, scriptlets on old scylla .rpm and new scylla .rpm is not completely same. To fix the issue we need to stop using systemd macros, call systemctl directly. Fixes #94 (cherry picked from commit 949cefc2515a0c72e38d10f82517fc12f6bbfab7)