Disable Centos 6 in Travis as it takes too long
Disable Centos 6 in Travis as it takes too long

Signed-off-by: Josh Barker <88d7d21fa8a250d4e915db098658a3f5a42acdfb@gmail.com>

chef-cookbooks/jenkins,chef-cookbooks/jenkins,opscode-cookbooks/jenkins,gshively11/jenkins,opscode-cookbooks/jenkins,opscode-cookbooks/jenkins,chef-cookbooks/jenkins,gshively11/jenkins,gshively11/jenkins