Increase Kafka container wait time for HTTP bindings examples (#1054)

Author: artur-ciocanu

examples/src/main/java/io/dapr/examples/bindings/http/README.md

@@ -60,7 +60,7 @@ Before getting into the application code, follow these steps in order to set up
 name: Setup kafka container
 expected_stderr_lines:
   - 'Creating network "http_default" with the default driver'
-sleep: 5
+sleep: 20
 -->
 
 ```bash