OAK-2002: TarMK: FileStore constructor loads all entries in the journal.log

Load the journal.log as strings and only instantiate the last RecordIds.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1614384 13f79535-47bb-0310-9956-ffa450edef68
OAK-2002: TarMK: FileStore constructor loads all entries in the journal.log

Exclude accidentally committed parts.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1614385 13f79535-47bb-0310-9956-ffa450edef68