[SSSD] [PATCHES] services startup and identification

[Simo Sorce]

The following 3 patches changes the way services are started up and
identify themselves to the monitor.

The first patch is just minor or cosmetic fixes.

The second patch changes the identification from monitor initiated to
service initiated and acked by the monitor. This allows the service to
perform the identification after it has completely set up all the dbus
channel and is ready to receive a reply avoiding nasty race conditions.

The third patch changes the way services are started at startup. The
Data Provider service is given a 1 second advantage so that it should
normally be all set up by the time other service start and try to
connect to it. This way services normally avoid racing against dp and
can fully initialize on the first attempt and not rely on reconnection.

Initial testing seem to work pretty well and startup does not show ugly
errors anymore.

I may send an additional separate patch to make services identify
against dp the same way they do against the monitor (ie service
initiated instead of server initiated). A patch will follow if I can
pull it off in a short time frame.

Simo.