Improved the documentation comment of CASTOR2/debian/VMGRCONFIG that so it

explicitly states that no comments should be put in the configuration file
read by the VMGR:

  /etc/castor/VMGRCONFIG

debian/VMGRCONFIG

-# Should contain an entry like 
+# All comments should be removed from this file before it is used by the VMGR.
+#
+# This file should contain a single line with the following syntax: 
 #
 # 	<username>/<password>@<server>
 #
@@ -6,4 +8,3 @@
 #
 #	castor/ABCDEF123456@castor
 #
-#username/password@server