Manage installAfterRestart for MSWindows based clients

Under MS Windows OS the jar files are locked by the system as long as the JVM is running.
Nuxeo's update system need to be able to replace or delete jars in order to manage the Marketplace packages installation.

Since there is no way to force unload the jars, the only solution is to shutdown the JVM and do the installation as part of the bootstrap process, before the Nuxeo jars get actually loaded.

This problem seems to be only present when Jars contains Java Class : this means Studio generated packages are safe.