use one pgroup for all of foreman and kill that since ruby 1.8 sucks at pgroups

lib/foreman/engine.rb

@@ -99,13 +99,7 @@ class Foreman::Engine
   # @param [String] signal  The signal to send to each process
   #
   def killall(signal="SIGTERM")
-    @running.each do |pid, (process, index)|
-      system "sending #{signal} to #{name_for(pid)} at pid #{pid}"
-      begin
-        Process.kill(signal, -1 * pid)
-      rescue Errno::ESRCH, Errno::EPERM
-      end
-    end
+    Process.kill "-#{signal}", Process.pid
   end
 
   # Get the process formation

lib/foreman/process.rb

@@ -36,16 +36,16 @@ class Foreman::Process
 
     if Foreman.windows?
       Dir.chdir(cwd) do
-        Process.spawn env, command, :out => output, :err => output, :new_pgroup => true
+        Process.spawn env, command, :out => output, :err => output
       end
     elsif Foreman.jruby?
       Dir.chdir(cwd) do
         require "posix/spawn"
-        POSIX::Spawn.spawn env, command, :out => output, :err => output, :pgroup => 0
+        POSIX::Spawn.spawn env, command, :out => output, :err => output
       end
     else
       Dir.chdir(cwd) do
-        Process.spawn env, command, :out => output, :err => output, :pgroup => 0
+        Process.spawn env, command, :out => output, :err => output
       end
     end
   end
@@ -55,7 +55,7 @@ class Foreman::Process
   # @param [String] signal  The signal to send
   #
   def kill(signal)
-    pid && Process.kill(signal, -1 * pid)
+    pid && Process.kill("-#{signal}", pid)
   rescue Errno::ESRCH
     false
   end