Revert force operating system to linux as it's handled by the infrastructure configuration

Author: fviale

rm/rm-server/src/main/java/org/ow2/proactive/resourcemanager/nodesource/infrastructure/SSHInfrastructureV2.java

@@ -171,8 +171,6 @@ protected void startNodeImpl(final InetAddress host) throws RMException {
         clb.setJavaPath(this.javaPath);
         clb.setRmHome(this.schedulingPath);
         clb.setPaProperties(sb);
-        // Target Operating System is necessary linux (while host os can be windows)
-        clb.setTargetOS(OperatingSystem.UNIX);
         // current rmcore shortID should be added to ensure uniqueness
         final String nodeName = "SSH-" + this.nodeSource.getName() + "-" + ProActiveCounter.getUniqID();
         clb.setNodeName(nodeName);