Change BridgeRuntime initialization sequence to have all config.initParams() taken into account.

Heya Jeanfrancois

with the current implementation of BridgeRuntime not all initParams are taken into account on starting up Nettosphere. We hit the issue on trying to configure a custom endpoint mapper through

```java
config.initParams().put(ApplicationConfig.ENDPOINT_MAPPER, "com.yo.DirectEndpointMapper"); 
```

Cheers, Christian.