please note, this is a regression issue and not reproducible with libvirt 1.2.8-16

description:
cannot "autostart --disable" a lxc vm in shutoff status, if the lxc vm experienced a "running" state between the "autostart --disable" and previous "autostart"

versions:
libvirt-1.2.16-1.el7.x86_64
qemu-kvm-rhev-2.3.0-2.el7.x86_64
kernel-3.10.0-254.el7.x86_64

How reproduced:
100%

steps:
1. # virsh -c lxc://
    # virsh # list --all
 Id    Name                           State
----------------------------------------------------
 -     lxc                            shut off

2. make sure lxc in shutoff state
2.1 virsh # destroy lxc
Domain lxc destroyed

2.2 check the lxc autostart files
# ll /etc/libvirt/lxc/autostart/
total 0


3. set lxc to autostart
3.1 virsh # autostart lxc
Domain lxc marked as autostarted


3.2 check the lxc autostart files, it appears
# ll /etc/libvirt/lxc/autostart/
total 0
lrwxrwxrwx. 1 root root 24 Jun 10 14:59 lxc.xml -> /etc/libvirt/lxc/lxc.xml


4. start lxc and check the autostart file
virsh # start lxc
Domain lxc started

# ll /etc/libvirt/lxc/autostart/
total 0
lrwxrwxrwx. 1 root root 24 Jun 10 14:59 lxc.xml -> /etc/libvirt/lxc/lxc.xml




5. destroy lxc and check the autostart file
virsh # destroy lxc
Domain lxc destroyed

# ll /etc/libvirt/lxc/autostart/
total 0
lrwxrwxrwx. 1 root root 24 Jun 10 14:59 lxc.xml -> /etc/libvirt/lxc/lxc.xml

6. disable the autostart for lxc (in shutoff state)
6.1 disable autostart 
virsh # autostart lxc --disable
Domain lxc unmarked as autostarted

6.2 check the autostart file
# ll /etc/libvirt/lxc/autostart/
total 0
lrwxrwxrwx. 1 root root 24 Jun 10 14:59 lxc.xml -> /etc/libvirt/lxc/lxc.xml     <==== it's still exist, and when service libvirtd restart, lxc will be running. 


additional info:
During the test, this issue can reproduced with following 2 conditions:
1. when run autostart --disable, lxc is in shutoff state.
2. between autostart and autostart --disable, the lxc should have experienced a running state.

So following situations also reproduced the bug
1. start lxc; autostart lxc; destroy lxc; autostart --disable lxc
2. autostart lxc; start lxc; destroy lxc; autostart --disable lxc

Following situations cannnot reproduce this issue,
1. start lxc; autostart lxc; autostart --disable lxc; destroy lxc
2. destroy lxc; autostart lxc; autostart --disable lxc; start lxc