https://github.com/italiangrid/pkg.storm/blob/v1.11.19/rpm/storm-webdav/storm-webdav.spec#L124
this is not enough to set ownership also on /var/log/storm, then installing only storm-webdav on node, the service doesn't start because of:
Nov 05 12:49:09 pool09.ifca.es systemd[1]: Started StoRM WebDAV service.
Nov 05 12:49:09 pool09.ifca.es bash[16697]: /bin/bash: /var/log/storm/webdav/storm-webdav-server.out: Permission denied
StoRM Puppet module doesn't manage log directory. Fixing module could be a fix waiting for next release.