libvirt.test: Add some more normal/error cases about sync test

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>
libvirt.test: Add some more normal/error cases for qemu-ga test

Add test for 'guest-ping', 'guest-fstrim', 'guest-fsfreeze-thaw',
'guest-fsfreeze-freeze', 'guest-fsfreeze-status' command

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>
libvirt.test: Skip test if option doesn't exist

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>
libvirt.test: Fix a typo in qemu-agent-command test

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>
libvirt.test: Add some more case for ping commond of qga

1.Add halt status test
2.Add pm-suspend status test
3.Add guest cpu busy test

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>
libvirt.test: Add some more fail information

1.Skip test if qga is not respond
2.Show the bug link for guest-shutdown
Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>
libvirt.test: Add fsfreeze command for qemu-agent-command test

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>
Merge pull request #239 from liyangfnst/agent_more

libvirt.test: Add some more normal/error cases about sync test