fix: shield:user create does not assign a default group

[kenjis]

Description
Supersedes #999
Fixes #998

The user registration form sets the default group value for the user when a new user is registered.
But the command shield:user create does not set the default group.
I think we should fix the inconsistency as a bug.

What do you think about reading the available roles from the config file and presenting that as a required choice to the user? #999 (comment)

It would be nice, but nobody has implemented it. It can be implemented as enhancement later.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[datamweb]

lonnieezell say: instead of being forced into the default and then having to go to the database to change it.

In any case, I do not see any problem in the implementation.

[kenjis]

Oh, I have not read the comment carefully. Thanks.

And @bgeneto suggested -g option instead of showing groups and the user interaction. #999 (comment)

[datamweb]

suggested -g option

I like this because of less user interactions.

[kenjis]

I sent a PR to implement -g option: #1164