playbooks/roles/tcwg-benchmark-sudo/files/tcwg-benchmark: Add /sbin/reboot

Allow tcwg-infra group members to run /sbin/reboot.

We would like to use this command before starting benchmarks,
to make sure the board is in a clean state.

Change-Id: Iba426cc0e0ff04de0296cdc046e2e5d3b47eb716
1 file changed