Munki does not reboot machine even Restart is ordered in pkginfo

What steps will reproduce the problem?
1. Install a pkg/mpkg using munki, installation goes through without any errors
2. After installation munki does not reboot computer

What is the expected output? What do you see instead?
No reboot.

What version of the Munki tools are you using? On what operating system?
0.8.0.1294 on OS X 10.6.

Please provide any additional information below.

There are no RestartAction-key within original pkg, only manually added to 
pkginfo:
<key>RestartAction</key>
<string>RequireRestart</string>

managedsoftware via command line reports that Restart is required but when 
running installation with MSU.app in loginwindow reboot never happens.
Managed Software Install.log reveals something about the package:
Nov 11 16:07:08 WARNING: Polite unmount failed: hdiutil: couldn't unmount 
"disk1" - Resource busy
Nov 11 16:07:08 Attempting to force unmount /private/tmp/dmg.E3VVqI

Probably there is a process left running and as it cannot be killed then munki 
does not restart???
This has happened with other pkgs too and they have no hung processes after 
installation.

Original issue reported on code.google.com by miq...@gmail.com on 11 Nov 2011 at 2:16

Merged into: #65

gonchik / munki

Munki does not reboot machine even Restart is ordered in pkginfo #129