Fix for quote characters in user logs returned as JSON

Fix for https://bugs.vestacp.com/issues/413

bin/v-list-user-log

@@ -24,6 +24,7 @@ json_list() {
     echo "{"
     for str in $logs; do
         eval $str
+        CMD=${CMD//\"/\\\"}
         echo -n '    "'$ID'": {
         "CMD": "'$CMD'",
         "UNDO": "'$UNDO'",