pool: do not list a repository during initialization

we run inventory as pool startup procedure. If a
concurrent getInfo arrives, then it will block on
repository lock. This will block message thread as well.

Do not try to get number of files in the repository
if repository is not operational yet.

Target: trunk, 2.13, 2.12, 2.11, 2.10
Require-notes: yes
Require-book: no
Acked-by: Gerd Behrmann
(cherry picked from commit 5e19ef8)
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>

modules/dcache/src/main/java/org/dcache/pool/repository/v5/CacheRepositoryV5.java

@@ -774,7 +774,7 @@ public void getInfo(PrintWriter pw)
     {
         pw.println("State : " + _state);
         try {
-            pw.println("Files : " + _store.list().size());
+            pw.println("Files : " + (_state == State.OPEN ?_store.list().size() : ""));
         } catch (CacheException e) {
             pw.println("Files : " + e.getMessage());
         }