ElasticContainer: Use version 5.6.16 for V5_6 tests

Change-Id: I9ab3de171dbf3774dfab47e4438f711df76c044c
1 file changed
tree: e3df82de5848a19f1cb1e19c1a4a58aa1195a2d0
  1. gerrit-acceptance-tests/
  2. gerrit-elasticsearch/
  3. gerrit-pgm/