You have two options for running dashboard with Apache. One is to simply install all of the pre-requisites and then run it normally without a virtualenv:

sudo pip install -r openstack-dashboard/tools/pip-requires

It's also possible to run Apache against a virtualenv:

http://stackoverflow.com/questions/3503793/running-django-in-virtualenv-using-apache-with-mod-python-and-multiple-python-ins (http://stackoverflow.com/questions/35...)