Cherry-pick-3.4-620-Adding control-plane nodes" - Requires tls-sans to be set for LB

[ranjinimn]

Closes #620

Edited content based on the information in the issue (#947)

[hardys]

Please can we fix the EOF issue on main before merging, then we can mark this as a combined backport of #947 and the EOF fix - otherwise the EOF issue will still exist in the 3.5 docs when we branch

[hardys]

@e-minguez is the EOF space issue shell specific? I just tried it on zsh and bash and it works fine with or without the space?

[e-minguez]

@e-minguez is the EOF space issue shell specific? I just tried it on zsh and bash and it works fine with or without the space?

I promised I tested it and it didn't worked... now I've tested it again with zsh and bash and it works. Apologies for the noise (again)

[hardys]

@e-minguez is the EOF space issue shell specific? I just tried it on zsh and bash and it works fine with or without the space?

I promised I tested it and it didn't worked... now I've tested it again with zsh and bash and it works. Apologies for the noise (again)

Ok, definitely good to check these things - as e.g leading space for the closing EOF will cause problems, but if we're agreed that in this case it's cosmetic lets merge the backports and not block on the change to main, thanks!