Improve: The case that there already exists a user whose username matches ID of the newly created LDAP user

[yuki-takei]

Environment

Host

item	version
crowi-plus	2.3.0 -

How to reproduce? (再現手順)

1. Create a local user (User.username is user1)
2. There is uid=user1 user in LDAP and login with user1
   • However, it is assumed that the password of the local user1 does not match the password of the LDAP user1

What happens? (症状)

• Login with LDAP is success but DuplicatedUsernameException is occured

What is the expected result? (期待される動作)

• The user can specify another username

[yuki-takei]

refs #137 (comment)

[yuki-takei]

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[yuki-takei]

#350 (v3.0.6 release) fixes this.

Now /admin/security page have an option below.

• Automatically bind external accounts newly logged in to local accounts when username match