Append placeholder required asterix to Validators.required

[tomgruszowski]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Input label/placeholder asterix (*) is appended based on FormControl - Validators.required and not just the HTML 'required' element attribute. The code should check the required attribute and the FormControl Validators for auto inserting the asterix.

What is the current behavior?

Required asterix only works with the input required attribute.

What is the use-case or motivation for changing an existing behavior?

Reactive forms moves the validation complexity away from markup and onto the code; this forces the markup and code to have the same duplicate required validation.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Latest ng/mat 5.x

[crisbeto]

Closing as a duplicate of #2574.

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