Fix missing else statement in addonsEnableCmd

Upgrade kube-dns to version 1.9

Fix typo in user-visible message

Update the RBAC hints for 1.5.1

The `--extra-config` argument now would be `apiserver.GenericServerRunOptions.AuthorizationMode`, and additionally one typically wants to set the super user as well.

It seems that this will change again soon, see https://github.com/kubernetes/kubernetes/commit/ca2b5f136eee4394dbd296ae640355c98f1fdb91 and related

Add a PodCIDR for kubenet.

Add 'enable' to the systemd commands for localkube.

Adds --keep-context flag for 'minikube start'

Add hyper-v switch to config set

fix some typos

Signed-off-by: NXinbo Weng <xihuanbo_0521@zju.edu.cn>

fix my errors
Signed-off-by: NXinbo Weng <xihuanbo_0521@zju.edu.cn>

fix duplicated 'the' and some 'a/an' errors

Update dockerfile to accommodate latest b2d changes.

Signed-off-by: NXinbo Weng <xihuanbo_0521@zju.edu.cn>

 Remove buildroot iso-url instructions in readme

This image is now the default, so no flag is needed

Bump minikube iso to v1.0.1, the buildroot based ISO

Switch systemd journald logging to volatile.

Upgrade arch linux installer to v0.14

Added -v level debug information to README.md

Add some unit tests for config.

Add some tests to our cert generation.

Deprecate show-libmachine-logs flag

Disable some kernel_config options

Fix logs Integration test