I attempted to reproduce this issue by installing a new SSL for cPanel/WHM/Webmail in WHM > Manage Service SSL Certificates area, but cPanel did get restarted on 11.28.86-EDGE_51183 for the SSL.
If anyone is still having this issue where installing a new SSL for cPanel/WHM/Webmail is not resulting in cPanel being restarted, please provide the cPanel version number and then open up a ticket with us:
Code:
cat /usr/local/cpanel/version
A ticket can be submitted from WHM > Support Center > Contact cPanel or using the link in my signature. If you do open up a ticket, please post the ticket number here.