guest-tools: support logger

Signed-off-by: Dunrong Huang <riegamaths@gmail.com>
guest-tools: exception support

catch the exceptions we care to console

Signed-off-by: Dunrong Huang <riegamaths@gmail.com>
gtools: rework ls command

Signed-off-by: Dunrong Huang <riegamaths@gmail.com>
gtools/config: only output user want to

Signed-off-by: Dunrong Huang <riegamaths@gmail.com>