[MdDialog] opening multiple dialog return wrong dialogRef.

[aitboudad]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

If I open a dialog while another is in the process of being opened it should be opened and return the dialogRef of the requested ones

What is the current behavior?

The requested dialog is ignored and a return a dialogRef which not belong the the requested dialog

What are the steps to reproduce?

https://github.com/angular/material2/blob/master/src/lib/dialog/dialog.ts#L123-L126

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

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

Is there anything else we should know?

[jelbourn]

@crisbeto we should do something to make this behavior more obvious

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