update so-image-common to use es version for es containers

salt/common/tools/sbin/so-common

@@ -168,6 +168,36 @@ check_salt_minion_status() {
 	return $status
 }
 
+# compare es versions and return the highest version
+compare_es_versions() {
+    # Save the original IFS
+    local OLD_IFS="$IFS"
+
+    IFS=.
+    local i ver1=($1) ver2=($2)
+
+    # Restore the original IFS
+    IFS="$OLD_IFS"
+
+    # Compare each segment of the versions
+    for ((i=0; i<${#ver1[@]}; i++)); do
+        if [[ -z ${ver2[i]} ]]; then
+            ver2[i]=0
+        fi
+        if ((10#${ver1[i]} > 10#${ver2[i]})); then
+            echo "$1"
+            return 0
+        fi
+        if ((10#${ver1[i]} < 10#${ver2[i]})); then
+            echo "$2"
+            return 0
+        fi
+    done
+
+    echo "$1"  # If versions are equal, return either
+    return 0
+}
+
 copy_new_files() {
   # Copy new files over to the salt dir
   cd $UPDATE_DIR