OPENDJ-1866: Make EntryIDSet more maintainable.

Yannick Lecaillez

16.36.2015 42fbf08eb02ea8464a6b03fc47b75ad400bed44f

opendj-server-legacy/src/main/java/org/opends/server/backends/pluggable/IDSetIterator.java does not exist in tree 4e57b104050b0fd9871b758f2d2c40b300e9d4d6