In addition to delorean and delorean-dep repo, you need to install peel

sudo yum install epel-release

This will get you through the install of the package

Also, if you are installing with Liberty, the name of the package that you need to install changed to:

sudo yum install python-tripleoclient

I am also trying to install RDO Manager in Centos and was successful about a week ago and now can’t get it to build again. Argh!