Update AMIs in cloudformation template.
Update AMIs in cloudformation template.

Signed-off-by: Ryan Hass <7a1efea0847aa10fda44596a4a622bd3187d968e@users.noreply.github.com>

chef-partners/omnibus-marketplace,chef-partners/omnibus-marketplace,chef-partners/omnibus-marketplace,chef-partners/omnibus-marketplace,chef-partners/omnibus-marketplace