Update update-center.json URL to a valid one
Update update-center.json URL to a valid one

Signed-off-by: Seth Thomas <70057f453423577300910f8d731f9c9b27b0f2fb@chef.io>

opscode-cookbooks/jenkins,chef-cookbooks/jenkins,b-dean/jenkins,dshvedchenko/jenkins,dshvedchenko/jenkins,b-dean/jenkins,juliandunn/jenkins,gshively11/jenkins,samdunne/jenkins,gshively11/jenkins,opscode-cookbooks/jenkins,chef-cookbooks/jenkins,Dispader/jenkins,Dispader/jenkins,opscode-cookbooks/jenkins,samdunne/jenkins,gshively11/jenkins,daften/cookbook-jenkins,daften/cookbook-jenkins,daften/cookbook-jenkins,juliandunn/jenkins,Dispader/jenkins,samdunne/jenkins,dshvedchenko/jenkins,chef-cookbooks/jenkins,b-dean/jenkins,juliandunn/jenkins