Replace "/bin/true" with a command that eats all input in some specs
Replace "/bin/true" with a command that eats all input in some specs

This fixes a bug where a broken pipe error sometimes appeared when
running specs (when "/bin/true" process managed to finish even before
the input was written to it by the select loop).

openSUSE/cheetah,mschnitzer/cheetah,mvidner/cheetah