Adding info trace to indicate when the reconfiguration actually took place

Traces should now appear as:

INFO: Trying connector creator type org.springframework.cloud.service.document.MongoDbFactoryCreator@3e19f58c
déc. 02, 2014 6:08:31 PM org.cloudfoundry.reconfiguration.spring.AbstractCloudServiceBeanFactoryPostProcessor reconfigureBean
INFO: Reconfigured bean org.springframework.data.mongodb.core.SimpleMongoDbFactory#0 into singleton service connector org.springframework.data.mongodb.core.SimpleMongoDbFactory@3160c0bd