Update the schema backend so that the creatorsName, createTimestamp,
modifiersName, and modifyTimestamp attributes are included in the subschema
subentry as recommended in RFC 4512 section 4.2.  The create timestamp will be
set to the oldest modification time of all the schema configuration files.  The
modify timestamp will be initially set to the youngest modification time of all
the schema configuration files, but if the schema is updated with the server
online then the modifiersName and modifyTimestamp will be updated accordingly.

OpenDS Issue Number:  1157