tsm_getvolumecontent: Don't skip damaged files(2)

The fix in commit f866fb0 to not skip
damaged files turned out to be incomplete.

If a volume was flagged access=unavailable or similar then files on it
would not be included and we would see very frequent retries.

This commit changes the volume list retrieval to only ignore volumes that
are empty or are pending (ie. empty/reclaimed but on deletion hold due to
storage pool reusedelay!=0).

Should also reduce the impact of #21

tsm_getvolumecontent.pl

@@ -99,7 +99,7 @@ sub debug
 
 # List volumes in the storage pools
 foreach my $stgpool (sort @stgpools) {
-    my @t=dsm_cmd("q vol stg=$stgpool access=readwrite,readonly status=online,filling,full") or die "Failed listing vols for $stgpool";
+    my @t=dsm_cmd("q vol stg=$stgpool status=online,offline,filling,full") or die "Failed listing vols for $stgpool";
     foreach my $line (@t) {
         my($volname, undef, undef, undef, undef, undef) = split (/\t/, $line);
         push @volumes, $volname;