Remove dependency on `kubectl` binary

[tjtelan]

Cluster start and cluster checks use the locally installed kubectl.

This is about our usage of kubectl in the Rust code. Not in shell scripts or CI

• crates/fluvio-cluster/src/check/mod.rs
• crates/fluvio-cluster/src/start/k8.rs
• crates/fluvio-cluster/src/cli/diagnostics.rs

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Calls we need to convert to using k8-api

• kubectl create secret
• kubectl delete secret
• kubectl create service
• kubectl delete service
• kubectl auth
• kubectl logs
• kubectl get pods
• kubectl get pvc
• kubectl get service
• kubectl get statefulset

And we're using kubectl to collect our CRDs

• kubectl get spu
• kubectl get topic
• kubectl get partition

---

Instances in the codebase to remove (List maybe not exhaustive. Last updated 12 Oct 2021):

https://github.com/infinyon/fluvio/blob/c9d694a6df687ff24bab1edf20d95c819dc3b987/crates/fluvio-cluster/src/check/mod.rs#L321 https://github.com/infinyon/fluvio/blob/c9d694a6df687ff24bab1edf20d95c819dc3b987/crates/fluvio-cluster/src/check/mod.rs#L819 https://github.com/infinyon/fluvio/blob/c9d694a6df687ff24bab1edf20d95c819dc3b987/crates/fluvio-cluster/src/check/mod.rs#L831 https://github.com/infinyon/fluvio/blob/c9d694a6df687ff24bab1edf20d95c819dc3b987/crates/fluvio-cluster/src/check/mod.rs#L890 https://github.com/infinyon/fluvio/blob/c9d694a6df687ff24bab1edf20d95c819dc3b987/crates/fluvio-cluster/src/start/k8.rs#L1055-L1081

https://github.com/infinyon/fluvio/blob/c9d694a6df687ff24bab1edf20d95c819dc3b987/crates/fluvio-cluster/src/cli/diagnostics.rs#L39-L48 https://github.com/infinyon/fluvio/blob/c9d694a6df687ff24bab1edf20d95c819dc3b987/crates/fluvio-cluster/src/cli/diagnostics.rs#L90-L97 https://github.com/infinyon/fluvio/blob/c9d694a6df687ff24bab1edf20d95c819dc3b987/crates/fluvio-cluster/src/cli/diagnostics.rs#L122

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Stale issue message

[pinkforest]

I came across this with minikube as the idiomatic way is to pipe alias kubectl via minikube kubectl -- foobar

And then naturally start was complaining about Kubectl not found which I guessed that it wants the executable in some $PATH

I first thought maybe it requires environment variable or maybe the intention was to port to using k8-API -

Too bad there isn't CLI mapping to API so have to translate the CLI calls to programmatic version.