Bug#981580: Replace isAlive by is_alive in /usr/share/hplip/scan/sane.py

[Maarten De Munck <mdemunck@gmail.com>]

Hi Daniel

Same problem here. The problem appeared when Python was upgraded to 
version 3.9.

Apparently the (deprecated) threading.Thread.isAlive() function is 
removed in Python 3.9 and one should use the threading.Thread.is_alive() 
function.

Just replacing all occurences of 'isAlive' in 
/usr/share/hplip/scan/sane.py by 'is_alive' solved the problem for me 
(up-to-date Debian Testing).

Best regards

Maarten