Retrieve sidecar containers logs

[glazychev-art]

Description:

Current implementation doesn't retrieve logs if we have sidecar containers.
For example, this is a tree of TestWebhook log files:

TestWebhook/
├── admission-webhook-k8s-6df5dbdbb7-gfffg.logs
├── forwarder-vpp-6tc4q.logs
├── forwarder-vpp-9l72v.logs
├── nsmgr-7ctql.logs
├── nsmgr-qnw49.logs
└── registry-k8s-79cf54777b-ltqv6.logs

As we can see, there is neither client nor endpoint log files