ldap:LDAPMulti: Add support for including the organization as part of the username.

This commit introduces a new configuration option for LDAPMulti authentication
sources (include_organization_in_username). When this option is set to TRUE,
the organization will be appended to the username.


git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@1412 44740490-163a-0410-bde0-09ae8108e29a