redirect df errors to stdout

CHANGELOG

@@ -14,6 +14,8 @@ The **patch** part changes is incremented if multiple releases happen the same m
 
 ### Changed
 
+redirect df errors to stdout
+
 ### Fixed
 
 ### Removed

dump-server-state.sh

@@ -673,7 +673,7 @@ task_df() {
     df_bin=$(command -v df)
 
     if [ -n "${df_bin}" ]; then
-        last_result=$(${df_bin} --portability > "${dump_dir}/df.txt")
+        last_result=$(${df_bin} --portability > "${dump_dir}/df.txt 2>&1")
         last_rc=$?
 
         if [ ${last_rc} -eq 0 ]; then