autotest/virt-test — pull request #1929 by yumingfei (2014-12-23 05:41:17+00:00)
Title: utils_libguestfs: Unset color environment for guestfish test.

For some Linux release(RHEL7.1), characters will have color
when we enter guestfish shell session. It may cause failure
of testcases. So covering it during testing.

Signed-off-by: Yu Mingfei