autotest/virt-test — pull request #1937 by yumingfei (2014-12-29 04:00:36+00:00)
Title: utils_libguestfs.virt_edit: Always passing format before -a.

Following error will happen if --format appears after -a on latest version:
virt-edit: --format parameter must appear before -a parameter

So provide it before -a by default.

Signed-off-by: Yu Mingfei