Workaround for s3gof3r bug
Add simple teardown sequence to prevent erlcloud disconnect error on closing test

Conflicts:
	riak_test/tests/access_stats_test.erl
Deprecate V2 Replication

As V2 replication is rarely used for CS, sometimes hard to maintain
and will be completely removed in future, with Riak CS 2.0 V2 replication
will not be supported any more. As there should be no code change
in Riak CS, CS is not sensitive to replication version.

Here is an upgrade guide:
http://docs.basho.com/riakee/latest/cookbooks/Multi-Data-Center-Replication-UpgradeV2toV3/
Update rt env build script
s3gof3r has been fixed and remove workaround
WIP: add upgrade/downgrade test
Fix r_t build scripts
Add first small upgrade tests

TODO: fix rtcs_bag.erl to run in multibag flavour
Add first small upgrade tests

TODO: fix rtcs_bag.erl to run in multibag flavour
Merge branch 'feature/riak-2.0-rebase-rebased' into feature/riak-2.0-rebased
Add example on upgrade riak_test setup
Add downgrading tests
Add default functions and fix multibag upgrade/downgrade
Remove sleep and add OSS selector
Update to the review comments
Add bitcask downgrade script to .gitignore and a bit cleanup
Point to correct multibag module. Should be pinned until release.
Merge pull request #992 from basho/feature/riak-2.0-rebased

Upgrade to Riak 2.0

Reviewed-by: shino