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Description of problem:
libvirt output an unknown error when use blockjob check a not exist disk path

Version-Release number of selected component (if applicable):
libvirt-1.2.17-1.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.
# virsh domblklist r7
Target     Source
------------------------------------------------
hda        /var/lib/libvirt/images/r7_latest.img
sdb        iqn.2014-11.com.lhuang:tgt1/2

2.
# virsh blockjob r7 1123
error: An error occurred, but the cause is unknown


3.

Actual results:
libvirt output an unknown error when use blockjob check a not exist disk path 

Expected results:
Point out we used a invalid address

Additional info:

A patch already send to review:
http://www.redhat.com/archives/libvir-list/2015-July/msg00370.html

Upstream fix:
commit b5c2245b0cddbb605fece8d8f3c7075d269e3302
Author: Luyao Huang <lhuang>
Date:   Thu Jul 9 11:49:15 2015 +0800

    qemu: report error for non-existing disk in blockjobinfo
    
    Before:
    
     # virsh blockjob r7 vdc
     error: An error occurred, but the cause is unknown
    
    After:
    
     # virsh blockjob r7 vdc
     error: Disk 'vdc' not found in the domain

v1.2.17-60-gb5c2245

Verified with libvirt-1.2.17-2.el7.x86_64

Steps
1. # virsh domblklist  vm3
Target     Source
------------------------------------------------
vda        gluster-vol1/rhel7.qcow2

2.# virsh blockjob vm3 vda
No current block job for vda

3. # virsh blockjob vm3 vda2
error: invalid argument: disk vda2 not found in the domain

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2202.html