remove shutdown sanbox out of setPodInitStatus
remove shutdown sanbox out of setPodInitStatus

since pod.cleanup is called in goroutine, it may set pod.sandbox to nil
at any given time, and p.sandbox.Shutdown can be called after checking
p.sandbox is not nil.

Signed-off-by: Gao feng <7f710758e13fe1707f3aa2e93d3a8f5444b6a90e@gmail.com>

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