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'killall' now outputs some debug info that is annoying and breaks some tests. 
The same issue was present and fixed in Debian:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=864753

Reproducible: Always

Steps to Reproduce:
Just run killall:
$ killall killall
sending signal 15 to procs
killall: no process found

The "sending signal 15 to procs" wasn't supposed to be there.

Actual Results:  
sending signal 15 to procs
killall: no process found

Expected Results:  
killall: no process found


See Debian bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=864753