Use default MaxStartups value.

Some versions of openssh (notably 8.9p1, as ships with Ubuntu 22.04) are
buggy with values of MaxStartups >= 1024 (see
https://lists.mindrot.org/pipermail/openssh-bugs/2022-March/023864.html
for details). Rather than try to tweak this setting, use the default
value of '10:30:100'.

xCAT/postscripts/remoteshell

@@ -61,8 +61,8 @@ then
         #delete all occurance of the attribute and then add xCAT settings
         sed -i '/X11Forwarding /'d /etc/ssh/sshd_config
         echo "X11Forwarding yes" >>/etc/ssh/sshd_config
+        # delete all MaxStartups settings and use default value
         sed -i '/MaxStartups /'d /etc/ssh/sshd_config
-        echo "MaxStartups 1024" >>/etc/ssh/sshd_config
 
     if [ "$SETUPFORPCM" = "1" ]; then
         if [[ $OSVER == sle* ]];then