respect spec user group config
respect spec user group config

Override image user group config if spec user group config is present.

Signed-off-by: Peng Tao <39d8af57313740070ea49547576f55682fe5221a@gmail.com>

feiskyer/hyper,laijs/hyperd,laijs/hyper,hyperhq/hyperd,gao-feng/hyper,gao-feng/hyper-public,hyperhq/hyper,gnawux/hyper,gao-feng/hyper,laijs/hyper,gnawux/hyper,gnawux/hyper,gao-feng/hyper-public,gao-feng/hyper,hyperhq/hyper,hyperhq/hyperd,laijs/hyperd,gao-feng/hyper-public,laijs/hyper,feiskyer/hyper,feiskyer/hyper,gao-feng/hyper,hyperhq/hyper,laijs/hyper,laijs/hyperd,hyperhq/hyperd,feiskyer/hyper,hyperhq/hyper