Add missing package on componentscan

Author: nvazquez

usage/src/main/resources/usageApplicationContext.xml

@@ -31,7 +31,7 @@
 	<context:annotation-config />
 	<context:component-scan
 		base-package="com.cloud.usage, com.cloud.event.dao, com.cloud.user.dao, com.cloud.configuration.dao, com.cloud.alert.dao, com.cloud.domain.dao, org.apache.cloudstack.framework.config.dao, org.apache.cloudstack.quota,
-      org.apache.cloudstack.quota.constant, org.apache.cloudstack.quota.dao, org.apache.cloudstack.quota.vo">
+      org.apache.cloudstack.quota.constant, org.apache.cloudstack.quota.dao, org.apache.cloudstack.quota.vo, com.cloud.vm.snapshot.dao">
 	</context:component-scan>
 
 	<!-- @DB support -->