inveniogc: better tempdir deletion

* FIX Fixes garbage collection of temporary directories created by
  websubmit_icon_creator and websubmit_file_stamper.
  (closes inveniosoftware#3556) (PR inveniosoftware#3558)

Signed-off-by: Alexander Wagner <alexander.wagner@desy.de>

modules/websession/lib/inveniogc.py

@@ -177,15 +177,15 @@ def clean_tempfiles():
             % (CFG_TMPDIR, CFG_TMPSHAREDDIR, \
                CFG_MAX_ATIME_RM_BIBDOC, vstr))
 
-    write_message("- deleting old temporary WebSubmit icons")
+    write_message("- deleting old temporary WebSubmit icon dirs")
     gc_exec_command('find %s %s -name "websubmit_icon_creator_*"'
-        ' -atime +%s -exec rm %s -f {} \;' \
+        ' -atime +%s -exec rm %s -rf {} \;' \
             % (CFG_TMPDIR, CFG_TMPSHAREDDIR, \
                CFG_MAX_ATIME_RM_ICON, vstr))
 
-    write_message("- deleting old temporary WebSubmit stamps")
+    write_message("- deleting old temporary WebSubmit stamp dirs")
     gc_exec_command('find %s %s -name "websubmit_file_stamper_*"'
-        ' -atime +%s -exec rm %s -f {} \;' \
+        ' -atime +%s -exec rm %s -rf {} \;' \
             % (CFG_TMPDIR, CFG_TMPSHAREDDIR, \
                CFG_MAX_ATIME_RM_STAMP, vstr))