Revert "Merge pull request #12 from autotest/provider-libs"

This reverts commit c6c5aa5719c1afd7d788b45b542c009cfb2c9590, reversing
changes made to 9ca076451044351e8c255465d33d0345f145993c.
Add new testcase virsh_save_image_define

The testcase virsh_save_image_define make a test for
virsh subcommand: save-image-dumpxml save-image-define

Signed-off-by: Guannan Ren <gren@redhat.com>