fix retrofit2rx sample due to bad merge

samples/client/petstore/java/retrofit2rx/src/main/java/io/swagger/client/ApiClient.java

@@ -375,62 +375,3 @@ class GsonCustomConverterFactory extends Converter.Factory
             return gsonConverterFactory.requestBodyConverter(type, parameterAnnotations, methodAnnotations, retrofit);
     }
 }
-
-/**
- * Gson TypeAdapter for Joda DateTime type
- */
-class DateTimeTypeAdapter extends TypeAdapter<DateTime> {
-
-    private final DateTimeFormatter parseFormatter = ISODateTimeFormat.dateOptionalTimeParser();
-    private final DateTimeFormatter printFormatter = ISODateTimeFormat.dateTime();
-
-    @Override
-    public void write(JsonWriter out, DateTime date) throws IOException {
-        if (date == null) {
-            out.nullValue();
-        } else {
-            out.value(printFormatter.print(date));
-        }
-    }
-
-    @Override
-    public DateTime read(JsonReader in) throws IOException {
-        switch (in.peek()) {
-            case NULL:
-                in.nextNull();
-                return null;
-            default:
-                String date = in.nextString();
-                return parseFormatter.parseDateTime(date);
-        }
-    }
-}
-
-/**
- * Gson TypeAdapter for Joda LocalDate type
- */
-class LocalDateTypeAdapter extends TypeAdapter<LocalDate> {
-
-    private final DateTimeFormatter formatter = ISODateTimeFormat.date();
-
-    @Override
-    public void write(JsonWriter out, LocalDate date) throws IOException {
-        if (date == null) {
-            out.nullValue();
-        } else {
-            out.value(formatter.print(date));
-        }
-    }
-
-    @Override
-    public LocalDate read(JsonReader in) throws IOException {
-        switch (in.peek()) {
-            case NULL:
-                in.nextNull();
-                return null;
-            default:
-                String date = in.nextString();
-                return formatter.parseLocalDate(date);
-        }
-    }
-}