Issue:
Loaded plugins: product-id, refresh-packagekit, subscription-manager
Proxy connection failed: 407 and want to get rid of this.
Fix:
Edit /etc/yum.conf file and change the value of plugins from 1 to 0 and this will disable the plugins.
Note: The above changes is suitable in the environment where proxy is not configured and Yum Repository is in place within the internal network environment.