Bump erlcloud dependency to 0.4.3
Set pb_backlog in Riak config for riak_test runs

Specify a pb_backlog of 256 in the Riak app.config for riak_test runs
to avoid spurious riak_test failures due to disconnected Riak pids.
Merge branch 'feature/bump-erlcloud-version' into develop
Merge branch 'feature/riak_test_pb_backlog_increase' into develop