Failed to start up libvirtd service after change replace the /etc/passwd and /etc/group

Issue

• Try to start up the libvirtd service by failed. From the libvirt status, it shows error information Failed to parse user 'qemu' and invalid argument: Failed to parse user 'qemu'.

systemctl status libvirtd
 libvirtd.service - Virtualization daemon
   Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled)
   Active: inactive (dead) since Thu 2017-04-27 19:53:22 HKT; 13min ago
     Docs: man:libvirtd(8)
           http://libvirt.org
  Process: 44265 ExecStart=/usr/sbin/libvirtd $LIBVIRTD_ARGS (code=exited, status=0/SUCCESS)
 Main PID: 44265 (code=exited, status=0/SUCCESS)

Apr 27 19:53:21 test systemd[1]: Starting Virtualization daemon...
Apr 27 19:53:21 test systemd[1]: Started Virtualization daemon.
Apr 27 19:53:22 test libvirtd[44265]: libvirt version: 1.2.17, package: 13.el7_2.5 (Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>, 2016-05-26-07:48:46, x86-020.build.eng.bos.redhat.com)
Apr 27 19:53:22 test libvirtd[44265]: invalid argument: Failed to parse user 'qemu'
Apr 27 19:53:22 test libvirtd[44265]: Initialization of QEMU state driver failed: invalid argument: Failed to parse user 'qemu'
Apr 27 19:53:22 test libvirtd[44265]: Driver state initialization failed