sd-bus: optionally, use inotify to wait for bus sockets to appear

This adds a "watch-bind" feature to sd-bus connections. If set and the
AF_UNIX socket we are connecting to doesn't exist yet, we'll establish
an inotify watch instead, and wait for the socket to appear. In other
words, a missing AF_UNIX just makes connecting slower.

This is useful for daemons such as networkd or resolved that shall be
able to run during early-boot, before dbus-daemon is up, and want to
connect to dbus-daemon as soon as it becomes ready.

src/test/meson.build

@@ -762,6 +762,10 @@ tests += [
          [],
          [threads]],
 
+        [['src/libsystemd/sd-bus/test-bus-watch-bind.c'],
+         [],
+         [threads], '', 'timeout=120'],
+
         [['src/libsystemd/sd-bus/test-bus-chat.c'],
          [],
          [threads]],