move gc connection to persistant.
move gc connection to persistant.

AndersenLab/CeNDR,AndersenLab/cegwas-web,AndersenLab/cegwas-web,AndersenLab/CeNDR,AndersenLab/cegwas-web,AndersenLab/CeNDR,AndersenLab/cegwas-web,AndersenLab/CeNDR