bump oldest kubernetes version to v1.19.0

[medyagh]

v.1.16 is very old

and new cri-dockerd APIs wont pass the test
https://storage.googleapis.com/minikube-builds/logs/17055/31367/KVM_Linux.html#fail_TestStartStop%2fgroup%2fold-k8s-version%2fserial%2fVerifyKubernetesImages

[k8s-ci-robot]

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This pull-request has been approved by: medyagh

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[medyagh]

/ok-to-test

[minikube-pr-bot]

kvm2 driver with docker runtime

+----------------+----------+---------------------+
|    COMMAND     | MINIKUBE | MINIKUBE (PR 17404) |
+----------------+----------+---------------------+
| minikube start | 52.2s    | 51.9s               |
| enable ingress | 28.0s    | 28.3s               |
+----------------+----------+---------------------+

Times for minikube ingress: 27.7s 32.2s 25.7s 26.7s 27.6s
Times for minikube (PR 17404) ingress: 28.1s 28.2s 28.2s 28.7s 28.2s

Times for minikube start: 52.4s 50.6s 52.7s 50.5s 55.1s
Times for minikube (PR 17404) start: 50.2s 52.9s 52.3s 54.2s 49.8s

docker driver with docker runtime

+----------------+----------+---------------------+
|    COMMAND     | MINIKUBE | MINIKUBE (PR 17404) |
+----------------+----------+---------------------+
| minikube start | 24.0s    | 24.1s               |
| enable ingress | 21.1s    | 21.3s               |
+----------------+----------+---------------------+

Times for minikube ingress: 20.8s 20.8s 21.9s 20.8s 20.9s
Times for minikube (PR 17404) ingress: 20.8s 20.9s 20.9s 22.8s 20.8s

Times for minikube start: 25.4s 23.8s 22.1s 24.0s 24.6s
Times for minikube (PR 17404) start: 22.2s 24.0s 24.2s 24.4s 25.6s

docker driver with containerd runtime

+----------------+----------+---------------------+
|    COMMAND     | MINIKUBE | MINIKUBE (PR 17404) |
+----------------+----------+---------------------+
| minikube start | 22.6s    | 21.8s               |
| enable ingress | 30.1s    | 34.7s               |
+----------------+----------+---------------------+

Times for minikube ingress: 31.3s 31.3s 33.3s 31.3s 23.4s
Times for minikube (PR 17404) ingress: 31.3s 31.3s 48.3s 31.3s 31.3s

Times for minikube start: 21.4s 20.4s 23.9s 23.3s 24.1s
Times for minikube (PR 17404) start: 21.4s 21.6s 22.6s 23.0s 20.1s

[minikube-pr-bot]

These are the flake rates of all failed tests.

Environment	Failed Tests	Flake Rate (%)
Docker_Linux_containerd	TestDownloadOnly/v1.19.0/cached-images (gopogh)	n/a
Docker_Linux_crio	TestDownloadOnly/v1.19.0/cached-images (gopogh)	n/a
Docker_Linux	TestDownloadOnly/v1.19.0/cached-images (gopogh)	n/a
Docker_macOS	TestDownloadOnly/v1.19.0/cached-images (gopogh)	n/a
Hyperkit_macOS	TestDownloadOnly/v1.19.0/cached-images (gopogh)	n/a
KVM_Linux_containerd	TestDownloadOnly/v1.19.0/cached-images (gopogh)	n/a
KVM_Linux_crio	TestDownloadOnly/v1.19.0/cached-images (gopogh)	n/a
KVM_Linux	TestDownloadOnly/v1.19.0/cached-images (gopogh)	n/a
Docker_Linux_containerd	TestIngressAddonLegacy/serial/ValidateIngressAddonActivation (gopogh)	0.00 (chart)
Docker_Linux_containerd	TestIngressAddonLegacy/serial/ValidateIngressDNSAddonActivation (gopogh)	0.00 (chart)
Docker_Linux_containerd	TestIngressAddonLegacy/StartLegacyK8sCluster (gopogh)	0.00 (chart)
Docker_Linux_crio	TestIngressAddonLegacy/serial/ValidateIngressDNSAddonActivation (gopogh)	0.00 (chart)
Docker_Linux_crio	TestIngressAddonLegacy/StartLegacyK8sCluster (gopogh)	0.00 (chart)
Docker_Linux_crio	TestMissingContainerUpgrade (gopogh)	0.00 (chart)
Docker_Linux_crio	TestStoppedBinaryUpgrade/MinikubeLogs (gopogh)	0.00 (chart)
Docker_Linux	TestIngressAddonLegacy/serial/ValidateIngressAddonActivation (gopogh)	0.00 (chart)
Docker_Linux	TestIngressAddonLegacy/serial/ValidateIngressAddons (gopogh)	0.00 (chart)
Docker_Linux	TestIngressAddonLegacy/serial/ValidateIngressDNSAddonActivation (gopogh)	0.00 (chart)
Docker_Linux	TestIngressAddonLegacy/StartLegacyK8sCluster (gopogh)	0.00 (chart)
Docker_Linux	TestMissingContainerUpgrade (gopogh)	0.00 (chart)
Docker_Linux	TestRunningBinaryUpgrade (gopogh)	0.00 (chart)
Docker_Linux	TestStoppedBinaryUpgrade/MinikubeLogs (gopogh)	0.00 (chart)
Docker_Linux	TestStoppedBinaryUpgrade/Upgrade (gopogh)	0.00 (chart)
Hyperkit_macOS	TestIngressAddonLegacy/serial/ValidateIngressDNSAddonActivation (gopogh)	0.00 (chart)
KVM_Linux_containerd	TestIngressAddonLegacy/serial/ValidateIngressAddonActivation (gopogh)	0.00 (chart)
KVM_Linux_containerd	TestIngressAddonLegacy/serial/ValidateIngressAddons (gopogh)	0.00 (chart)
KVM_Linux_containerd	TestIngressAddonLegacy/serial/ValidateIngressDNSAddonActivation (gopogh)	0.00 (chart)
KVM_Linux_containerd	TestIngressAddonLegacy/StartLegacyK8sCluster (gopogh)	0.00 (chart)
KVM_Linux_crio	TestIngressAddonLegacy/serial/ValidateIngressAddonActivation (gopogh)	0.00 (chart)
KVM_Linux_crio	TestIngressAddonLegacy/serial/ValidateIngressDNSAddonActivation (gopogh)	0.00 (chart)
More tests...	Continued...

Too many tests failed - See test logs for more details.

To see the flake rates of all tests by environment, click here.