Update logging formats

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>
Add consumer workers

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>
Add delivery verification

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>
wip

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>