Fix for issue 4332 (Tools fail when instance path contains whitespace)
The problem is in the code in charge of checking the install and instance paths and contents.  There are issues both in the scripts and in the code of org.opends.server.tools.configurator.CheckInstance.  Using quotes fixes the issue in the script and using an array of String instead of a single command-line to launch the "ls" process.

Apart from that some error messages have also been fixed.