virttest.utils_test: Add libguestfs module.

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
libguestfs.tests: Move shared classes and functions to utils_test.

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
virt-libvirt: Removed trailing whitespace

Signed-off-by: Chris Evich <cevich@redhat.com>