fix: [rsync-backup-target] make target accept ``rsync`` client ``3.2.0``

Starting from ``3.2.0`` introduced ``Ivu`` server commands, these are
now accepted.

rsync-backup-target/build/src/usr/local/sbin/ssh-cmd-validate

@@ -45,7 +45,7 @@ if [[ "$SSH_ORIGINAL_COMMAND" =~ [\&\(\{\;\<\>\`\$\}] ]]; then
     reject
 fi
 
-if [[ "$SSH_ORIGINAL_COMMAND" =~ ^"rsync --server -"[vnloHgDtpArRzCeiLsfx\.]+(" --"[a-z=%-]+|" --partial-dir .rsync-partial")*" . /var/mirror/$ident"$ ]]; then
+if [[ "$SSH_ORIGINAL_COMMAND" =~ ^"rsync --server -"[vnloHgDtpArRzCeiLsfxIu\.]+(" --"[a-z=%-]+|" --partial-dir .rsync-partial")*" . /var/mirror/$ident"$ ]]; then
 	log "ACCEPTED BACKUP COMMAND: $SSH_ORIGINAL_COMMAND"
 
     ## Interpret \ to allow passing spaces (want to avoid possible issue with \n)
@@ -56,7 +56,7 @@ if [[ "$SSH_ORIGINAL_COMMAND" =~ ^"rsync --server -"[vnloHgDtpArRzCeiLsfx\.]+("
          "--log-file=/var/log/rsync/target_$1_rsync.log" \
          "--log-file-format=%i %o %f %l %b" \
          "${ssh_args[@]:3}"
-elif [[ "$SSH_ORIGINAL_COMMAND" =~ ^"rsync --server --sender -"[vnloHgDtpArRzCeiLsfx\.]+(" --"[a-z=%-]+|" --partial-dir .rsync-partial")*" . /var/mirror/$ident"(|/.*)$ ]]; then
+elif [[ "$SSH_ORIGINAL_COMMAND" =~ ^"rsync --server --sender -"[vnloHgDtpArRzCeiLsfxIu\.]+(" --"[a-z=%-]+|" --partial-dir .rsync-partial")*" . /var/mirror/$ident"(|/.*)$ ]]; then
 
     ## Interpret \ to allow passing spaces (want to avoid possible issue with \n)
     #read -a ssh_args <<< "${SSH_ORIGINAL_COMMAND}"