staging.service: introduce a command for service module of reset_failed.

When we start a service too frequently in systemd style system, we will
get an error. In this case, we can run a reset-failed command to solve
this problem.

This patch make service be able to run reset_failed command.

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
utils_libvirtd: call reset_failed() before starting libvirtd.

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>