run_test.sh -V --unit doesn't run using virtualenv
run_test.sh -V --unit doesn't run using virtualenv

Before this change, when you called the script using the -V option, the tests
were run outside the virtualenv that the script creates.
To fix it, I modified the lines of the script that run the tests to run
inside the virtualenv using the $wrapper variable.

Change-Id: I5c202727e0b5214670d54e14c80a68cc8ebec400
Closes-Bug: #1251730

cwolferh/heat-scratch,jasondunsmore/heat,takeshineshiro/heat,pshchelo/heat,ntt-sic/heat,maestro-hybrid-cloud/heat,cryptickp/heat,noironetworks/heat,miguelgrinberg/heat,srznew/heat,gonzolino/heat,openstack/heat,takeshineshiro/heat,pshchelo/heat,srznew/heat,steveb/heat,cryptickp/heat,cwolferh/heat-scratch,steveb/heat,dims/heat,redhat-openstack/heat,rdo-management/heat,dims/heat,pratikmallya/heat,noironetworks/heat,NeCTAR-RC/heat,pratikmallya/heat,dragorosson/heat,jasondunsmore/heat,miguelgrinberg/heat,redhat-openstack/heat,rdo-management/heat,ntt-sic/heat,NeCTAR-RC/heat,openstack/heat,dragorosson/heat,gonzolino/heat,maestro-hybrid-cloud/heat,rh-s/heat,rh-s/heat