Update CNAME for Fastly.
Update CNAME for Fastly.

This updates the CNAME to use the Fastly legacy CDN host which supports
SSLv3, TLS 1.0, and TLS 1.1 which will be supported until June 2018.

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

chef/opscode-omnitruck,chef/opscode-omnitruck,chef/opscode-omnitruck,chef/omnitruck,chef/omnitruck,chef/omnitruck