Refactor backup server initialization and job actor output writing

build/includes/summa_actor/summa_client.hpp

build/includes/summa_actor/summa_server.hpp

build/source/actors/job_actor/job_actor.cpp

build/source/actors/main.cpp

build/source/actors/summa_actor/summa_actor.cpp

build/source/actors/summa_actor/summa_backup_server.cpp

build/source/actors/summa_actor/summa_client.cpp

build/source/actors/summa_actor/summa_server.cpp