Exposes method to see if the backup was consistent or not
Consistency checker closes the report file

when it's done writing the report, if any.
Oh and StringLogger#lazyLogger() was changed so that close() on such will
not first create the logger to then close it right after, instead close
only if it was created earlier.
Merge remote-tracking branch 'upstream/1.9-maint'

Conflicts:
	enterprise/consistency-check/src/main/java/org/neo4j/consistency/ConsistencyCheckService.java