Fix systemd event handling

Right now the systemd event handling is not actually working at all.
This happens because _listener_message_path_is_our_session() has code to
check if the event came to our session (e.g. "10") and, under systemd,
does this by trying to compare it with the object path, by stripping the
/org/freedesktop/login1/session/ prefix.

However, under -at least recent versions- of systemd, the session ID
part of the path is escaped separately, and following D-Bus rules
initial numbers are escaped. In the example above, the obj_path is
/org/freedesktop/login1/session/_310, so the comparison actually fails.

Port a fix that has been present on various distributions (e.g. Arch)
and pieces of software (e.g. cinnamon-screensaver) since at least March
2013.  The original author is Peter de Ridder <[email protected]>.

The bug and the fix can both be easily verified by running "loginctl
lock-sessions".

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