Feature request: print partial results on SIGINFO

[asomers]

It would be really handy if Kyua would print partial test results on SIGINFO. It would look something like this:

$ kyua test my_test
my_test:a -> passed [1.2s]
my_test:b -> passed [3.4s]
my_test:c -> failed: Testcase failed [0.1s]
my_test:d ->
2 passed, 1 failed, 0 skipped, 2 to go
passed [0.1s]
my_test:e -> passed [1.9s]

Results file id is XXX
Results saved to YYY

4/5 passed ( 1 failed)