`ng new` should error on multiple args

[vikerman]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Command (mark with an x)

- [x] new
- [ ] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Versions

v7.0.0-rc.2

Repro steps

Running ng new with extra args doesn't throw an error. This could happen when user forgets to put --directory

ng new hello test/path/hello

Should display an error. Instead it just creates a new directory hello/ and continues without any errors.

Desired functionality

Display error message about extra args

[alan-agius4]

Apparently even invalid arguments are not erroring out example:

ng new my app —foo

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