Need to require net/ldap in tests (#18192).

git-svn-id: http://svn.redmine.org/redmine@13521 e93f8b46-1217-0410-a6f0-8f06a7374b81
Code cleanup, removed raw SQL.

git-svn-id: http://svn.redmine.org/redmine@13522 e93f8b46-1217-0410-a6f0-8f06a7374b81
Code cleanup.

git-svn-id: http://svn.redmine.org/redmine@13523 e93f8b46-1217-0410-a6f0-8f06a7374b81
Removed unused instance variable.

git-svn-id: http://svn.redmine.org/redmine@13524 e93f8b46-1217-0410-a6f0-8f06a7374b81
Code cleanup.

git-svn-id: http://svn.redmine.org/redmine@13525 e93f8b46-1217-0410-a6f0-8f06a7374b81