sasl: simplify UID verification
sasl: simplify UID verification

Instead of parsing the UID from the client, rather compare the string
verbatim to what we expect. There is no ambiguity when encoding UIDs,
so don't allow anything but perfect matches.

Signed-off-by: David Herrmann <fb53b2ddb8d141e0cb39d7c67c2f81b6bc2eb0f7@gmail.com>

bus1/dbus-broker