[session] take care of non-ascii characters in login and session id (closes: #1910849)
We ensure a valid <str> conversion of the session id by using unormalize() at initialization.
option_group_changed('port', 'main', 'web')
option_group_changed('query-log-file', 'main', 'web')
option_group_changed('profile', 'main', 'web')
option_group_changed('max-post-length', 'main', 'web')