Upgrade gluster client in ISO to 4.1.5

[ansiwen]

No description provided.

[k8s-ci-robot]

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[minikube-bot]

Can one of the admins verify this patch?

[ansiwen]

/assign @dlorenc

[nixpanic]

I've tested an iso image that @ansiwen passed along, and can confirm it works well. The new GlusterFS release provides a few more features in the FUSE client that I was looking forward to.

Thanks!

[tstromberg]

@minikube-bot OK to test

[tstromberg]

Linux-None test failure appears to be known flake: #3196