Adapt log levels for STANBOL-1139: changed logging for EventJobManager 
 - durations are no longer logged on INFO (as this is now provided by STANBOL-1267)
 - extended INFO loggings for failed jobs are now logged in the EnhancementJobManager logger introduced by STANBOL-1267


git-svn-id: https://svn.apache.org/repos/asf/stanbol/branches/release-0.12@1560376 13f79535-47bb-0310-9956-ffa450edef68