support fullchain. If the real cert path equals to the ca cert path, we will append the ca cert to the domain cert, which makes it a fullchain.

le.sh

@@ -862,8 +862,13 @@ installcert() {
     if [ -f "$Le_RealCACertPath" ] ; then
       cp -p "$Le_RealCACertPath" "$Le_RealCACertPath".bak
     fi
+    if [ "$Le_RealCACertPath" == "$Le_RealCertPath" ] ; then
+      echo "" >> "$Le_RealCACertPath"
+      cat "$CA_CERT_PATH" >> "$Le_RealCACertPath"
+    else
       cat "$CA_CERT_PATH" > "$Le_RealCACertPath"
     fi
+  fi
 
 
   if [ "$Le_RealKeyPath" ] ; then