Only update limits when needed

src/freedombone-utils-setup

     if ! grep -q '* hard maxsyslogins' /etc/security/limits.conf; then
         echo '* hard maxsyslogins 10' >> /etc/security/limits.conf
     else
-        sed -i 's|hard maxsyslogins.*|hard maxsyslogins 10|g' /etc/security/limits.conf
+        if ! grep -q '* hard maxsyslogins 10' /etc/security/limits.conf; then
+            sed -i 's|hard maxsyslogins.*|hard maxsyslogins 10|g' /etc/security/limits.conf
+        fi
     fi
 
     # Max logins for each user
     if ! grep -q '* hard maxlogins' /etc/security/limits.conf; then
         echo '* hard maxlogins 2' >> /etc/security/limits.conf
     else
-        sed -i 's|hard maxlogins.*|hard maxlogins 2|g' /etc/security/limits.conf
+        if ! grep -q '* hard maxlogins 2' /etc/security/limits.conf; then
+            sed -i 's|hard maxlogins.*|hard maxlogins 2|g' /etc/security/limits.conf
+        fi
     fi
 }
 
 }
 
 function disable_core_dumps {
-    if ! grep -q '* hard core 0' /etc/security/limits.conf; then
+    if ! grep -q '* hard core' /etc/security/limits.conf; then
         echo '* hard core 0' >> /etc/security/limits.conf
     else
-        sed -i 's|hard core.*|hard core 0|g' /etc/security/limits.conf
+        if ! grep -q '* hard core 0' /etc/security/limits.conf; then
+            sed -i 's|hard core.*|hard core 0|g' /etc/security/limits.conf
+        fi
     fi
 }