doc: caveats and peculiarities of container startup sequencing

[draychev]

This GitHub issue is to document the caveats and peculiarities of container startup sequencing

• what happens if the payload container starts before the Envoy is configured and it needs to check connection to the outside world
• What tools do we have at our disposal to control the sequence of containers starting?
• What could be expected in logs and Kubernetes events etc when payload container starts before Envoy is ready?
• point to the Kubernetes issue, which may resolve this in Kubernetes eventually
• point to the OSM GitHub Issue, which could tackle this within OSM

[shashankram]

Same as openservicemesh/osm#2316

[shashankram]

@draychev assigning this to you for review phase.

[shashankram]

Documented at https://docs.openservicemesh.io/docs/guides/troubleshooting/container_startup/