vfs: use List#copyOf instead of Guava's ImmutableList

Acked-by: Lea Morschel
Acked-by: Paul Millar
Acked-by: Albert Rossi
Target: master

core/src/main/java/org/dcache/nfs/FsExport.java

@@ -20,7 +20,6 @@
 package org.dcache.nfs;
 
 import com.google.common.base.Splitter;
-import com.google.common.collect.ImmutableList;
 import com.google.common.io.Files;
 import com.google.common.net.InetAddresses;
 import com.google.common.net.InternetDomainName;
@@ -127,7 +126,7 @@ public class FsExport {
         _allRoot = builder.isAllRoot();
         _withPnfs = builder.isWithPnfs();
         _index = getExportIndex(_path);
-	_layoutTypes = ImmutableList.copyOf(builder.getLayoutTypes());
+        _layoutTypes = List.copyOf(builder.getLayoutTypes());
     }
 
     public static int getExportIndex(String path) {