INT-2998: Channel Adapters' Lifecycle Refactoring

* Add XSD attributeGroup `smartLifeCycleAttributeGroup`
* Use it for all adapters tags
* Refactoring `AbstractChannelAdapterParser` hierarchy
* Refactoring some `MessageHandler`'s that should not have `autoStartup` & `phase`.
    It is the responsibility of `AbstrctEndpoint`
* Polishing some tests according new logic

JIRA: https://jira.springsource.org/browse/INT-2998

INT-2998: Polishing

Polishing

 - Reformat schemas where indentation changed
 - Add SLC to the UDP inbound adapter

spring-integration-mongodb/src/main/resources/org/springframework/integration/mongodb/config/spring-integration-mongodb-3.0.xsd

@@ -108,17 +108,7 @@
 				Common configuration for mongodb adapters.
 			</xsd:documentation>
 		</xsd:annotation>
-		<xsd:attribute name="id" type="xsd:string" />
-		<xsd:attribute name="channel" type="xsd:string">
-			<xsd:annotation>
-				<xsd:documentation>
-					Reference to a Message Channel that will be used
-					by this adapter to
-					'receiveFrom' or 'sendTo' Messages depending on the adapter type (e.g.,
-					inbound/outbound)
-				</xsd:documentation>
-			</xsd:annotation>
-		</xsd:attribute>
+		<xsd:attributeGroup ref="integration:channelAdapterAttributes"/>
 		<xsd:attribute name="mongodb-factory" type="xsd:string">
 			<xsd:annotation>
 				<xsd:appinfo>
@@ -183,7 +173,5 @@
 				</xsd:documentation>
 			</xsd:annotation>
 		</xsd:attribute>
-		<xsd:attribute name="auto-startup" type="xsd:string"
-			default="true" />
 	</xsd:complexType>
 </xsd:schema>