INTEXT-197: Lifecycle attrs for s3-outbound-c-a

JIRA: https://jira.spring.io/browse/INTEXT-197

* Modified the `org/springframework/integration/aws/config/xml/spring-integration-aws-1.0.xsd` to add `channelAdapterAttributes` to expose
`phase` attribute in `s3 outbound adapter`.
* Modified `AmazonS3OutboundChannelAdapterParserTests` - Added Unit Test Class to test the `channelAdapterAttributes`.
* Modified `s3-valid-outbound-cases.xml` - Added separate definition `withChannelAdapterAttributes` for phase attribute.

Polishing according PR comments

src/test/resources/s3-valid-outbound-cases.xml

@@ -68,6 +68,21 @@
 		</int-aws:request-handler-advice-chain>
 	</int-aws:s3-outbound-channel-adapter>
 
+	<int-aws:s3-outbound-channel-adapter
+			id="withChannelAdapterAttributes"
+			channel="input"
+			bucket="TestBucket"
+			accessKey="dummy"
+			secretKey="dummy"
+			remote-directory="/"
+			charset="US-ASCII"
+			phase="100"
+			auto-startup="false"
+			thread-pool-executor="executor"
+			multipart-upload-threshold="5120"
+			temporary-suffix=".write"
+			file-name-generation-expression="headers['name']"/>
+
 	<bean id="queue" class="java.util.concurrent.ArrayBlockingQueue">
 		<constructor-arg value="10"/>
 	</bean>