Subtask 2: Adding system info printout 

A user reported the following:

Hi! I have added support for showing system information about the host of the service. Everything works except memory usage. It shows very strange values and I haven’t been able to figure out why. Could you please help with that as well?

sysinfo_flow.json

CMakeLists.txt

sysinfo_task.hpp

systeminfo_task_runner.hpp

flow.cpp

sysinfo_task.cpp

flow_runner.cpp

systeminfo_task_runner.cpp

system_info.hpp

Git patch