deploy_minikube.sh: when running on Centos8 we should use podman instead of Docker

[liranmauda]

By the look of it, minikube support for podman is still WIP.
We can see 2 things:

1. Using the podman driver is experimental
2. even though the driver is podman, the run-time is docker and changing it to cri-o still looks for docker (Fedora 31 vm-driver=podman fail to start trying to start docker service kubernetes/minikube#6795).

We are using MINIKUBE_VERSION=v1.8.2 and KUBERNETES_VERSION=v1.17.3 due to kubernetes/minikube#7828

running with podman results in:

+ main@./1.sh:70 cat /root/.minikube/config/config.json
{
    "WantNoneDriverWarning": false,
    "WantUpdateNotification": false,
    "container-runtime": "cri-o",
    "driver": "podman",
    "vm-driver": "none"
}+ main@./1.sh:72 minikube version
minikube version: v1.8.2
commit: eb13446e786c9ef70cb0a9f85a633194e62396a1
+ main@./1.sh:74 minikube start --kubernetes-version=v1.17.3
😄  minikube v1.8.2 on Centos 8.1.1911
    ▪ MINIKUBE_VERSION=v1.8.2
✨  Using the podman (experimental) driver based on user configuration
E0705 15:30:53.797867   10377 cache.go:106] Error downloading kic artifacts:  error loading image: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

once podman support in minikube will be better, and we will be able to upgrade the minikube version we can switch to podman on Centos8.

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