JIRA: https://jira.spring.io/browse/INT-4074
If the `@ServiceActivator` component is processed first the application will start.
However, if another component that relies on the channel creation goes first it'll fail as the bean for the channel does not exist.
* Add `name` setters for all channels in the `GatewayProxyFactoryBean` to allow late channel resolution in the target `MethodInvocationGateway`
* Change `MessagingGatewayRegistrar` to populate channel properties as names not bean references
**Cherry-pick to 4.2.x**
ecf9554fd0