Bug 525267 - Update platform.ua to Lucene 7

This migrates platform code to be compatible with Lucene 7. Added tests
to support compatibility scenarios.

All search tests succeed.

Change-Id: Ied949b34b25fac9ef8a6f381c1c095f80bee05e4
Signed-off-by: Sopot Cela <scela@redhat.com>
21 files changed