ftp: show SIZE facts for directories

Motivation:

The Globus server supplies the SIZE fact for directories.

Although supplying this information is not required by any specification
or agreement, its omission may be causing problems with clients that are
unable to parse MLSD output.  Since we have this information anyway,
supplying it poses no additional overhead.

Modification:

Show size fact for directory items.

Result:

Potentially better compatibility with Globus clients.

Target: master
Request: 3.0
Request: 2.16
Requires-notes: yes
Requires-book: no
Patch: https://rb.dcache.org/r/10062/
Acked-by: Dmitry Litvintsev

modules/dcache-ftp/src/main/java/org/dcache/ftp/door/AbstractFtpDoorV1.java

@@ -4284,7 +4284,6 @@ public Set<FileAttribute> getRequiredAttributes()
             for (Fact fact: _currentFacts) {
                 switch (fact) {
                 case SIZE:
-                    attributes.add(SIMPLE_TYPE);
                     attributes.add(SIZE);
                     attributes.addAll(_pdp.getRequiredAttributes());
                     break;
@@ -4345,7 +4344,7 @@ public void print(FsPath dir, FileAttributes dirAttr, DirectoryEntry entry)
                 for (Fact fact: _currentFacts) {
                     switch (fact) {
                     case SIZE:
-                        if (attr.isDefined(SIZE) && attr.getFileType() != FileType.DIR) {
+                        if (attr.isDefined(SIZE)) {
                             access = _pdp.canGetAttributes(_subject, attr, EnumSet.of(SIZE));
                             if (access == AccessType.ACCESS_ALLOWED) {
                                 printSizeFact(attr);