Add test for virsh net-dumpxml v4

Now I resend a new pull request for virsh net-dumpxml with some commit messages.

Li Yang (1):
  libvirt: Add test module for virsh net-dumpxml

 libvirt/tests/cfg/virsh_net_dumpxml.cfg |   36 ++++++++++++++++
 libvirt/tests/virsh_net_dumpxml.py      |   70 +++++++++++++++++++++++++++++++
 2 files changed, 106 insertions(+), 0 deletions(-)
 create mode 100755 libvirt/tests/cfg/virsh_net_dumpxml.cfg
 create mode 100755 libvirt/tests/virsh_net_dumpxml.py