Boone Gorges a1f89f4e86 Use 'invalid_username' error code when tripping 'illegal_user_logins'.
This gives us better compatibility with existing errors thrown by
`sanitize_user()`, especially in Multisite, where user_login has more
restrictions on allowed characters.

Props markjaquith.
Fixes #27317.

git-svn-id: https://develop.svn.wordpress.org/trunk@35772 602fd350-edb4-49c9-b593-d223f7449a82
2015-12-04 23:24:56 +00:00
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