inced release
Upgrade to Netty 4.0.21
AsyncFile cannot stream files over 2GB [BZ-441052]

Signed-off-by: Julien Viet <julien@julienviet.com>
Merge pull request #888 from vietj/2.x

AsyncFile cannot stream files over 2GB [BZ-441052]
must set client mode before applying ssl params
Event bus should be registered in the management registry only after the server for the cluster has started

Signed-off-by: Vladyslav Oleniuk <vlad.oleniuk@gmail.com>
fixed problems with starting vert.x in the cluster