--extra-config with double quotes breaks kubeadm init

[medyagh]

we should validate options like this

./out/minikube start --driver=docker --extra-config=etcd.client-cert-auth=false”

currently running that will make minikube kubeadm hang.

[vinu2003]

Hey @medyagh I can help with this.
/assign @vinu2003

[medyagh]

@vinu2003 it's yours !

[vinu2003]

Reproduced this issue. started working on PR.

[RA489]

@vinu2003 Are you still working on this issue?

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