In case you're also trying to remove software agent (AKA darwin/AppD agent), you can grab the prepare_vra_template.sh script from the vRA appliance at https://[appliance-fqdn]/software/download/prepare_vra_template.sh
There's actually a bug in this script where it uses Debian package management (apt-get) by default, even if it matches an RPM-based/EL distro. So you need to modify the script and at the top under the #Global Variables section, where it says use_rpm= and change it to use_rpm=true
make it executable by running chmod +x ./prepare_vra_template.sh from the directory where you downloaded the script.
then run it using sudo ./prepare_vra_template.sh -l rhel64 -u
It will remove all the agents.
