feature(autocomplete): add @Input() disabled property

Bug, feature request, or proposal:

The autocomplete should have a disabled input. Sometimes you want to mark the associated input as readonly (you do not want the disabled styles applied to the input) and do not want the autocomplete to fire up when you click on the component (in the cases you have some minimal default options)

What is the expected behavior?

To have an @Input() disabled in autocomplete. As the Datepicker has a disabled property, to keep the consistency, the autocomplete should have one too.

What is the current behavior?

Without the @Input() disabled you have to clear up the array, what is a not so difficult task, but it would be more consistent if it had a disabled property, like Datepicker.

[julianobrasil]

@Upimage, I think this can help you: #3334

Specifically, I’d take a look at @willshowell’s solution: https://github.com/angular/material2/issues/3334#issuecomment-319191915

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