Improve FileStagerSvc and add a test

• Add ssh capability to FileStagerSvc (expert use)
• Remove capability to copy LFNs directory using lcg-cp and add fix a property.

Single commit MR for 2018, the commit can be cherry-picked to master.

Tools/FileStager/FileStager/FileStagerFunctions.h

 // $Id: $
-#ifndef FILESTAGER_FILESTAGERFUNCTIONS_H 
+#ifndef FILESTAGER_FILESTAGERFUNCTIONS_H
 #define FILESTAGER_FILESTAGERFUNCTIONS_H 1
 
 #include <string>
 
 namespace FileStager {
    bool createPFN( std::string& remote, std::string& command, bool stageLocal = false );
-   bool createLFN( std::string& remote, std::string& command );
 }
 
 #endif // FILESTAGER_FILESTAGERFUNCTIONS_H