Hugepages: use tee when writing with sudo

[mcgov]

Prefer
echo 'value' | sudo tee /possibly/priviledged/file <- uses pipe, sudo is explicitly applied to file write
over
sudo sh -c 'echo "value" ' > /possibly/priviledged/file <- uses redirect, sudo is applied to the echo only (or based on the whims of the shell)

This avoids occasional weird silent failures. This was present previously in the DPDK hugepages code but it must have been swapped back to echo during the hugepages refactor.