libvirt: New sub module for libvirt_python.

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
libvirt_python: Add test for open() function in libvirt_python.

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
virt: Add new module to wrap functions for libvirt python.

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
libvirt_python: Add libvirtError into module utils_libvirt_python

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
libvirt_python: move libvirt/tests/{src, cfg}/libvirt_python to libvirt/tests/{src, cfg}/api/libvirt_pyhon.

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>