CAR-1744: Make sure that call_plugin can be aborted by hard shutdown/reboot
CAR-1744: Make sure that call_plugin can be aborted by hard shutdown/reboot

Signed-off-by: Zheng Li <34c6fceca75e456f25e7e99531e2425c6c1de443@zheng.li>

Frezzle/xen-api,agimofcarmen/xen-api,Frezzle/xen-api,agimofcarmen/xen-api,guard163/xen-api,djs55/xen-api,agimofcarmen/xen-api,agimofcarmen/xen-api,anoobs/xen-api,rafalmiel/xen-api,thomassa/xen-api,salvocambria/xen-api,robertbreker/xen-api,euanh/xen-api,anoobs/xen-api,rafalmiel/xen-api,guard163/xen-api,robertbreker/xen-api,thomassa/xen-api,guard163/xen-api,jjd27/xen-api,salvocambria/xen-api,Frezzle/xen-api,agimofcarmen/xen-api,euanh/xen-api,thomassa/xen-api,rafalmiel/xen-api,srowe/xen-api,rafalmiel/xen-api,vasilenkomike/xen-api,anoobs/xen-api,salvocambria/xen-api,djs55/xen-api,jjd27/xen-api,salvocambria/xen-api,anoobs/xen-api,thomassa/xen-api,vasilenkomike/xen-api,vasilenkomike/xen-api,vasilenkomike/xen-api,vasilenkomike/xen-api,agimofcarmen/xen-api,djs55/xen-api,guard163/xen-api,simonjbeaumont/xen-api,robertbreker/xen-api,jjd27/xen-api,thomassa/xen-api,robertbreker/xen-api,guard163/xen-api,euanh/xen-api,Frezzle/xen-api,jjd27/xen-api,djs55/xen-api,djs55/xen-api,srowe/xen-api,simonjbeaumont/xen-api,euanh/xen-api,srowe/xen-api,srowe/xen-api,Frezzle/xen-api,simonjbeaumont/xen-api,euanh/xen-api,rafalmiel/xen-api,anoobs/xen-api,euanh/xen-api,robertbreker/xen-api,jjd27/xen-api,srowe/xen-api,robertbreker/xen-api,simonjbeaumont/xen-api,salvocambria/xen-api,rafalmiel/xen-api,vasilenkomike/xen-api,thomassa/xen-api,djs55/xen-api,anoobs/xen-api,salvocambria/xen-api,guard163/xen-api,simonjbeaumont/xen-api,simonjbeaumont/xen-api,jjd27/xen-api