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Description of problem:

improve the error when undefine transient network

Version-Release number of selected component (if applicable):

libvirt-1.3.2-1.el7.x86_64

How reproducible:

100%

Steps to Reproduce:

1. Prepare transient network

# virsh net-list --transient
 Name                 State      Autostart     Persistent
----------------------------------------------------------
 default              active     no            no


2. Try to undefine it
# virsh net-undefine default

error: Failed to undefine network default
error: cannot remove config file '/etc/libvirt/qemu/networks/default.xml': No such file or directory

3.

Actual results:

as above 

Expected results:

error: Failed to undefine network default
error: Requested operation is not valid: can't undefine transient network

Additional info:

A patch has been proposed upstream:
https://www.redhat.com/archives/libvir-list/2016-March/msg00174.html

Fixed upstream:

commit 347035f95999934ad0c5f50b9544c34fc797833d
Author: Shanzhi Yu <shyu>
Date:   Sun Mar 6 18:54:21 2016 +0800

    qemu: improve the error when try to undefine transient network

v1.3.2-68-g347035f

This bug was accidentally moved from POST to MODIFIED via an error in automation, please see mmccune with any questions

verified on libvirt-1.3.3-1.el7.x86_64, the result is as expected.

# virsh net-list 
 Name                 State      Autostart     Persistent
----------------------------------------------------------
 default              active     no            yes
 definebr1            active     no            no
 netboot              active     no            yes

# virsh net-undefine definebr1
error: Failed to undefine network definebr1
error: Requested operation is not valid: can't undefine transient network

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/RHSA-2016-2577.html