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

@@ -180,18 +180,7 @@
 	</xsd:element>
 
 	<xsd:complexType name="InboundChannelAdapterType">
-		<xsd:attribute name="id" type="xsd:string" use="optional" />
-		<xsd:attribute name="channel" type="xsd:string" use="optional">
-			<xsd:annotation>
-				<xsd:appinfo>
-					<tool:annotation kind="ref">
-						<tool:expected-type
-							type="org.springframework.integration.MessageChannel" />
-					</tool:annotation>
-				</xsd:appinfo>
-			</xsd:annotation>
-		</xsd:attribute>
-
+		<xsd:attributeGroup ref="integration:channelAdapterAttributes"/>
 		<xsd:attribute name="error-channel" type="xsd:string"
 			use="optional">
 			<xsd:annotation>
@@ -219,4 +208,4 @@
 		</xsd:attribute>
 
 	</xsd:complexType>
-</xsd:schema>
+</xsd:schema>