Ensure the tests assetstore has a valid name.
Ensure the tests assetstore has a valid name.

Modify the auto-generated assetstore name used when the assetstore is
gridfs.  This allows plugin tests to specify a gridfs assetstore in
setUp.

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