required md-select is not higlighted as error on form submit

[vovikdrg]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Select should be red same way as md-input

What is the current behavior?

Select is not highlighted it stay as untouched

What are the steps to reproduce?

https://plnkr.co/edit/jEvWLqsrlUrnBjkUUBes?p=preview click submit and you will see that input is showing error but select is not

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

Should be same way as other components

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

@angular/animations: 4.3.2
@angular/cdk: 2.0.0-beta.8
@angular/common: 4.3.2
@angular/compiler: 4.3.2
@angular/core: 4.3.2
@angular/forms: 4.3.2
@angular/http: 4.3.2
@angular/material: 2.0.0-beta.8
@angular/platform-browser: 4.3.2
@angular/platform-browser-dynamic: 4.3.2
@angular/router: 4.3.2
@angular/cli: 1.2.6
@angular/compiler-cli: 4.3.2

Is there anything else we should know?

In addition if required validator is applied md- controls should have asterix so user understand that fields are required. In Example md-input has required validator but label doesn't have *

[crisbeto]

This is resolved in master by #4754.

[finalxcode]

+1

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