Support post install generation of nodes SSL certificate based on pulp server.conf

https://rally1.rallydev.com/#/7675694122d/detail/userstory/13300906487

Support post install generation of nodes SSL certificate based on pulp server.conf.  The katello installer updates the pulp sever.conf to use candlepin CA and generates a new password from the pulp *admin* user.  Long term should look into having nodes use OAUTH or something .  This is just an interim fix.