First commit for tracker cases. Still need to modify main.pm to make it work.
First commit for pidgin cases. These cases should be test under good network condition.Otherwise,will be failed by timeout.
Modify a comment.
this is the cutfile case
Re-introduce finish_desktop

It's needed for the live test only.

This reverts commit fd6667d5265bae3d85d1a0931f5bc307a7cc33c3.
apply finish_desktop only for live test
increase timeout

live cd takes ages to boot. Also close kde greeter