Implement search column in accounts table

[tomneedham]

Steps to reproduce

1. Setup LDAP
2. Add custom search attributes
3. Try to search for a sharee using these custom attributes

Expected behaviour

• Find users based on these attributes

Actual behaviour

• Only displayname is searched in accounts table currently

Motivation

owncloud/user_ldap#96

Proposal

• Additional column in accounts table to provide additional search terms 'additional_search_terms'
• User Manager search inspects email, displayname, user_id and additional_search_terms fields in DB
• User backends can provide a string which is loaded into this column on insertion to the account table and on user:sync

Additionally, the search method would have config options to remove ability to search by email, by displayname, or by login/user_id as the admin desires.

Plan:

• Add migration to add additional column to accounts table
• Add backend capability to supply additional search attributes in string
• Adjust usermanager find method to read additionally from the search strings

[tomneedham]

#27906

[lock]

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