v2v.tests: List all testcases as default.

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
virttest.libvirt_storage: Undefine pool anyway for delete_pool.

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
virttest.utils_v2v: Support both network and bridge option.

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
utils_test.libvirt: Add mk_label function.

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
Revert deleting of v2v_quick filters.

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
Merge pull request #1757 from yumingfei/fix_v2v

V2V: Fix some problems