DUBBO-344 Logger自动搜索slf4j和jcl

git-svn-id: http://code.alibabatech.com/svn/dubbo/trunk@1575 1a56cb94-b969-4eaa-88fa-be21384802f2

dubbo-common/pom.xml

@@ -33,10 +33,12 @@
 		<dependency>
 			<groupId>org.slf4j</groupId>
 			<artifactId>slf4j-api</artifactId>
+			<scope>provided</scope>
 		</dependency>
 		<dependency>
 			<groupId>commons-logging</groupId>
 			<artifactId>commons-logging-api</artifactId>
+			<scope>provided</scope>
 		</dependency>
 		<dependency>
 			<groupId>log4j</groupId>