add plugin_prefix option to install test
add plugin_prefix option to install test

jbeezley/girder,Kitware/girder,girder/girder,Xarthisius/girder,Kitware/girder,girder/girder,Kitware/girder,Xarthisius/girder,manthey/girder,manthey/girder,Xarthisius/girder,Kitware/girder,sutartmelson/girder,data-exp-lab/girder,adsorensen/girder,jbeezley/girder,Xarthisius/girder,sutartmelson/girder,sutartmelson/girder,RafaelPalomar/girder,data-exp-lab/girder,RafaelPalomar/girder,data-exp-lab/girder,manthey/girder,kotfic/girder,RafaelPalomar/girder,adsorensen/girder,kotfic/girder,adsorensen/girder,sutartmelson/girder,adsorensen/girder,Xarthisius/girder,RafaelPalomar/girder,data-exp-lab/girder,RafaelPalomar/girder,kotfic/girder,girder/girder,girder/girder,manthey/girder,sutartmelson/girder,data-exp-lab/girder,jbeezley/girder,jbeezley/girder,adsorensen/girder,kotfic/girder,kotfic/girder