autotest/virt-test — pull request #1274 by Xiangmin (2013-12-19 11:01:31+00:00)
Title: unattended_install.cfg: limit disk num to 6 in multi_disk_install when sing ahci

An ahci controller can have up to 6 downstream devices,
so need to limit disk num to 6.

history:
V2:
add image1 in the images value
V1:
assign 6 stg name as the images value

Signed-off-by: Xiangmin Han