As a developer, Pulp, Plugins, and python dependencies are installed into a single virtual environment
The plugins need to be installed into a virtual environment that is also in the Python path used by celery. This is necessary for plugin discovery to function on the workers.
Practically, this means that we need to change the ansible roles to put everything into the same virtualenv. To do this, developer systemd unit files will need to point to the virtualenv.
1. Update the ansible roles to install everything into a single virtualenv. Create systemd unit files that use that celery. 
2. Remove the Systemd unit files from the http://github.com/pulp/pulp. 
Systemd unit files removed
Units will need to be created differently by the various ways to
install Pulp, so a unit file that hardcodes the path to the Pulp
dependency is not ideal.
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