[AutoQA] #389: add function to get window position into LDTP

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#389: add function to get window position into LDTP
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 Reporter:  hongqing  |       Owner:                                 
     Type:  task      |      Status:  new                            
 Priority:  major     |   Milestone:  Automate installation test plan
Component:  core      |    Keywords:                                 
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 The cursor should be captured when the guest's virt-viewer window  pops
 up, so the terminal arguments can be typed in. LDTP offers the function to
 get the window size, but do not offer
 function to get the window position. So it is impossible to calculate the
 coordination the the mouse should click.[[BR]]
 We will contact with the LDTP team to develop a such function or submit a
 patch for them.