Scripts folder can not be found in RunAsMe mode when scheduling path contains spaces

[lpellegr]

When proactive-server is used from a directory whose hierarchy contains directory names that contain spaces, then the following exception is raised during the execution of a native task:

[10000@oops;15:46:34] org.objectweb.proactive.extensions.processbuilder.exception.FatalProcessBuilderException: Scripts folder can not be found at: '/home/lpellegr/ProActive Releases/ProActiveWorkflowsScheduling-linux-x64-6.2.0//dist/scripts/processbuilder/linux/'! 

Spaces from the scheduler path should probably be escaped before to be given to the launch.sh script.

It affects 6.2.0.