Force utf-8 encoding for ldap omniauth_info.name

Administratorrequested to merge
github/fork/mmozuras/ldap_name_utf8 into master

Created by: mmozuras

Hi,

I tried to configure LDAP authentication. It didn't work. I tracked it down to "incompatible character encodings" exception when trying to create a user. Fixed it by forcing utf-8 encoding on omniauth_info.name.

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