Prevent rootwrap from aggressively filing logs

- Add sudoers config to have neutron-rootwrap not log to syslog

Issue rcbops/chef-cookbooks#913

(cherry picked from commit ef8be968e78b9bd57b416c0f0c5ea751e2ff3c56)
Merge pull request #26 from claco/v4.2.3rc

Merged automatically by jenkins after successful build test