Don't issue a link for User 1 if disabled

[Genero-Jay]

Is your feature request related to a problem? Please describe.
drush uli when called without any arguments provides a login link for User 1. However, I (and many others) disable User 1 after other site administrators are created. So often I'll come to a site that I haven't used recently, and this happens:

1. I generate login link
2. Use the login link on the given site
3. Get an access denied error
4. Remember that user 1 is blocked
5. Start again

Describe the solution you'd like
I'm thinking that drush uli could have it's UX improved by either throwing an exception if the user is blocked, or appending a message mentioning that the user is blocked along with the link.

A further improvement could be to introduce a dialogue:

1. $ drush uli

2.  User 1 is disabled. Would you like to:
    [0] Cancel
    [1] Issue link anyways
    [2] Issue a link for another user
   

3. $ 2

4.  Search by:
    [0] UID
    [1] Name
   

5. $ 1
6. Enter the username
7. $ Dave
8. https://www.example.com/user/login/...

[Chi-teck]

Makes sense. Blocking User 1 is a common practice. I would just emit an error and return non-zero exit code if the user is blocked.

[weitzman]

Woops. This was fixed in #4934