OPENDJ-1075 Port server make-ldif tool to the SDK
CR-2603

CLI for MakeLDIF 

* Class MakeLDIF.java
  - uses the new EntryGenerator class from opendj-core to generate entries
  - uses LDIFEntryWriter class from opendj-core to write entries to LDIF
* Differences from opendj server version :
 - remove configfile and configclass options
 - add "--constant" ("-c") option to provide constants from the command line
   those constants override pre-defined constants in template file
 - if no "--ldiffile" option is provided, output LDIF to the standard output
* Add MakeLDIFTestCase to test basic behavior of the tool