Can we have separate argument for Failed testcases in show_results.py

[naveen538]

Having separate argument for Failed testcases would be helpful.
Ultimately our goal is to fix the issues from failed testcases.

[manjuhr1]

Fixed.

fail,conf,brok,skip -t : shows all test results
./show_results.py -t fail : shows the failed tests
./show_results.py -t fail,brok : shows failed and broken tests
./show_results.py -t fail,conf,brok,skip : shows fail,conf,brok,skip

Thanks,
Manju