Comment 34 for bug 857651

Created patch against latest ubuntu source package.

It creates the option to write a key-value-pair to a configuration file named /etc/accountsservice.conf,
in which you can specify with the key "hidden-users" a space separated list of the hidden users.

Example content of /etc/accountsservice.conf:

#
# accountsservice config file
#
# [Users]
# hidden-users = space separated list of users to exclude
#
[Users]
hidden-users=not_me imhidden