Write condump output to passed file name
Write condump output to passed file name

When we pass arg to /condump command, it should be taken as file
name where command output should be written to. Now if arg is
passed, it is taken as file name. If no arg is passed, file name
is generated by the engine.

Fixes https://github.com/DaemonEngine/Daemon/issues/304

DaemonEngine/Daemon,DaemonEngine/Daemon,DaemonEngine/Daemon,DaemonEngine/Daemon