[MomentDateAdapter] "useUtc" no effect for parsing

[hanyu-natsu]

Bug, feature request, or proposal:

MatDatepickerInput does not take care of "useUtc" option when parsing dates.

What is the expected behavior?

When "useUtc" is enabled, dates are created using moment.utc

What is the current behavior?

_isUTC = false

What are the steps to reproduce?

Providing a StackBlitz reproduction is the best way to share your issue.

https://stackblitz.com/edit/adapter-use-utc-parsing-issue

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

User input is not correct parsed as UTC moment objects when UTC is wanted.

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

angular 6.0.0+
material 6.3.2+

Is there anything else we should know?

Focus on:
https://github.com/angular/material2/blob/9a85b9ba74e3f3715e85b7b94019403290c67742/src/material-moment-adapter/adapter/moment-date-adapter.ts#L180-L185

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