Added docs diagram of SS internal architecture

Signed-off-by: Daniel (dmilith) Dettlaff <dmilith@verknowsys.com>
Switched error log to fatal in case of not found port file for service. Added TODO - deathWatch() instead of kill.

Signed-off-by: Daniel (dmilith) Dettlaff <dmilith@verknowsys.com>