Add test for virsh net-destroy v3

I resend a pull request about virsh net-destroy with my net_destroy branch.

Li Yang (1):
  libvirt: Add test module for virsh net-destroy

 libvirt/tests/cfg/virsh_net_destroy.cfg |   34 ++++++++++++++
 libvirt/tests/virsh_net_destroy.py      |   74 +++++++++++++++++++++++++++++++
 2 files changed, 108 insertions(+), 0 deletions(-)
 create mode 100644 libvirt/tests/cfg/virsh_net_destroy.cfg
 create mode 100644 libvirt/tests/virsh_net_destroy.py