More informative message when an Identifier cannot be created

Tag the IdentifierException onto the new RuntimeException instead of ignoring it.
let Maven filter log4j.properties, added new loglevel properties to control loglevel
Merge pull request #233 from hardyoyo/DS-1565-make-debug-logging-safer

let Maven filter log4j.properties, added new loglevel properties
DS-1576 fix names of LDAP configuration properties
[DS-1550] relativePath was not re-corrected.