security/softether5: make LogFileList command [1] work properly

• Move patch files to my GitHub fork to follow upstream easier
• Use separate PIDDIR from DBDIR

[1] https://www.softether.org/4-docs/1-manual/6._Command_Line_Management_Utility_Manual/6.3_VPN_Server_%2F%2F_VPN_Bridge_Management_Command_Reference_(For_Entire_Server)#6.3.55_.22LogFileList.22:_Get_List_of_Log_Files