[openstreetmap/openstreetmap-website] Initial user_factory refactoring (#1423)

[Andy Allan]

This pull request starts the process of replacing the users.yml fixtures with a user factory. Given the size of the change by the end of the process, I plan to submit several individual pull requests.

This PR creates the user and user_role factories, and refactors only the test/models/user_test.rb file. 

Given the number of tests involved even just with this one file, I've broken it down further into separate commits, so the `git blame` etc can have specific comments. If this PR is still too big, or something is controversial, I'm happy to split this PR into the ~11 separate PRs - but then each PR is a bit trivial.

Future work will involve refactoring other places where the user fixtures are used.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/1423

-- Commit Summary --

  * Create a simple user factory, and convert some basic tests.
  * Add with_home_location trait for user factories.
  * Add a user_role factory
  * Add moderator_user and administrator_user factories.
  * Add status traits to user factory.
  * Convert class method tests to use User factory.
  * User factory for uniqueness tests
  * Convert test_friend_with to use factories, and use alice/bob/charlie for easier understanding.
  * Refactor the friend_users test, and remove the tests which duplicate the (renamed) test_friends_with above.
  * Use factory for user language tests
  * Convert the test_users_nearby to user factories.

-- File Changes --

    M app/models/user_role.rb (1)
    A test/factories/user.rb (44)
    A test/factories/user_role.rb (6)
    M test/models/user_test.rb (171)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/1423.patch
https://github.com/openstreetmap/openstreetmap-website/pull/1423.diff

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