Remove redundant config field

example_config/ckserver.json

@@ -7,6 +7,5 @@
 		"RedirAddr":"204.79.197.200:443",
 		"PrivateKey":"EN5aPEpNBO+vw+BtFQY2OnK9bQU7rvEj5qmnmgwEtUc=",
 		"AdminUID":"5nneblJy6lniPJfr81LuYQ==",
-		"DatabasePath":"userinfo.db",
-		"BackupDirPath":""
+  "DatabasePath": "userinfo.db"
 }

internal/server/state.go

@@ -18,7 +18,6 @@ type rawConfig struct {
 	PrivateKey   string
 	AdminUID     string
 	DatabasePath string
-	BackupDirPath string
 	CncMode      bool
 }
 
@@ -72,6 +71,7 @@ func (sta *State) ParseConfig(conf string) (err error) {
 	}
 
 	if preParse.CncMode {
+		//TODO: implement command & control mode
 
 	} else {
 		manager, err := MakeLocalManager(preParse.DatabasePath)