UTIL: expand_homedir_template manages usernames internally expand_homedir_template() can be considered an outward-facing interface, therefore the function and its input structure will accept the internal name format and parse it internally into a username and domain component. Reviewed-by: Sumit Bose <sbose@redhat.com>

NSS: UPN as a template expansion for homedir mappings Fixes: https://fedorahosted.org/sssd/ticket/2340 Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

NSS: Add option to expand homedir template format LDAP server can contain template for home directory instead of plain string. This patch adds new expand option "%H", which will be replaced with value from configuration option homedir_substring (from sssd.conf) Resolves: https://fedorahosted.org/sssd/ticket/1853

NSS: Refactor expand_homedir_template Function expand_homedir_template had lot of parameters. After adding new expand option, all function call should be rewritten, (usually argument NULL will be added) This patch wraps all necessary arguments to structure.

Allow using flatname for subdomain home dir template https://fedorahosted.org/sssd/ticket/1609

NSS: Add original homedir to home directory template options https://fedorahosted.org/sssd/ticket/1805

Moved expand_homedir_template() from NSS responder to utility code