release v1.12.0-beta1

add solution message when container create is stuck

ensure deleting failed hosts if --delete-on-failure is specified

make docker driver highly preferred

add unit test for docker-env with none shell

Disable containerd from starting up at boot

Saves us having to restart docker later on

Run gofmt on pkg/minikube/shell/shell.go

skip cni test for none driver

Upgrade golang version from 1.13.8 to 1.13.9

Gracefully exit if container runtime is misspelled

Don't verify nf_conntrack for br_netfilter

add solution message if kubeadm binary is not executable on linux

We need to make sure that the br_netfilter kernel module
has been loaded, when using non-Docker container runtimes.

But the code was verifying the nf_conntrack kernel module
instead, so it could still cause the "not loaded" error.

[ERROR FileContent--proc-sys-net-bridge-bridge-nf-call-iptables]

Kernel with CONFIG_IKHEADERS for BPF tools on Kubernetes

BCC tools need to have access to kernel headers. It can be done either
by installing linux-headers packages or by having a kernel compiled with
CONFIG_IKHEADERS so that enough information can be retrieved via
/sys/kernel/kheaders.tar.xz.

BCC tools are used in Inspektor Gadget, a collection of tools for
developers of Kubernetes applications. I would like Inspektor Gadget to
support Minikube.

CNI: Update CRIO netconfig with matching subnet

add verification for enabling ingress, registry and gvisor addons