print the output of spawned unixdomaincm test on error

test/examples.jl

@@ -34,11 +34,14 @@ include(joinpath(dir, "queens.jl"))
 # Different cluster managers do not play well together. Since
 # the test infrastructure already uses LocalManager, we will test the simple
 # cluster manager example through a new Julia session.
-
 @unix_only begin
  script = joinpath(dir, "clustermanager/simple/test_simple.jl")
  cmd = `$(joinpath(JULIA_HOME,Base.julia_exename())) $script`
- if !success(cmd) && ccall(:jl_running_on_valgrind,Cint,()) == 0
+
+ (strm, proc) = open(cmd)
+ wait(proc)
+ if !success(proc) && ccall(:jl_running_on_valgrind,Cint,()) == 0
+ println(readall(strm))
  error("UnixDomainCM failed test, cmd : $cmd")
  end
 end