Import atomix/{storage,utils}

Import atomix/{storage,utils}

This is an import of our upstream dependency, atomix-storage, along with
its dependency, atomix-utils.

The atomix.io team has decided to abandon their Java code and archived
it under https://github.com/atomix/atomix-archive.

As per https://github.com/atomix/atomix-archive/blob/master/LICENSE,
this code is licensed under Apache License 2.0, which is compatible with
Eclipse Public License 1.0, which we are using.

This code drop imports the source code for the two artifacts we use, as
of their latest available state as available at
https://github.com/atomix/atomix-archive/tree/5c57662f8be16d3448c4c9cac2e2bec9317c4300
in verbatim, without any changes or actual build integration.

JIRA: CONTROLLER-2069
Change-Id: I873779dba9eac350e92e1c4dae69a79da43d3068
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>