Add container resource request and limit checks for ephemeral-storage.

New kube-score checks would mirror existing container CPU and Memory checks; including the option to ignore ephemeral-storage limits not being set.

Examples:

$ kube-score score pod-testfile1.yaml

[CRITICAL] Container Resources
· app -> Ephemeral Storage limit is not set
Resource limits are recommended to avoid resource DDOS. Set
resources.limits.ephemeral-storage
· log-aggregator -> CPU limit is not set
Resource limits are recommended to avoid resource DDOS. Set
resources.limits.cpu
· log-aggregator -> Memory limit is not set
Resource limits are recommended to avoid resource DDOS. Set
resources.limits.memory
· log-aggregator -> CPU request is not set
Resource requests are recommended to make sure that the application
can start and run without crashing. Set resources.requests.cpu
· log-aggregator -> Memory request is not set
Resource requests are recommended to make sure that the application
can start and run without crashing. Set resources.requests.memory

$ kube-score score --ignore-container-ephemeral-storage-limit pod-testfile1.yaml
[CRITICAL] Container Resources
· log-aggregator -> CPU limit is not set
Resource limits are recommended to avoid resource DDOS. Set
resources.limits.cpu
· log-aggregator -> Memory limit is not set
Resource limits are recommended to avoid resource DDOS. Set
resources.limits.memory
· log-aggregator -> CPU request is not set
Resource requests are recommended to make sure that the application
can start and run without crashing. Set resources.requests.cpu
· log-aggregator -> Memory request is not set
Resource requests are recommended to make sure that the application
can start and run without crashing. Set resources.requests.memory