Redirect serial console to /dev/null to fix issues with Ubuntu boxes
Redirect serial console to /dev/null to fix issues with Ubuntu boxes

Signed-off-by: Krzysztof Wilczyński <5f1c0be89013f8fde969a8dcb2fa1d522e94ee00@linux.com>

kwilczynski/packer-templates,kwilczynski/packer-templates