Move etcd, logger, crypto into their own packages (#8366)

- Deprecates _MINIO_PROFILER, `mc admin profile` does the job
- Move ENVs to common location in cmd/config/

pkg/quick/encoding.go

@@ -179,9 +179,6 @@ func loadFileConfigEtcd(filename string, clnt *etcd.Client, v interface{}) error
 // decoder format according to the filename extension. If no
 // extension is provided, json will be selected by default.
 func loadFileConfig(filename string, v interface{}) error {
-	if _, err := os.Stat(filename); err != nil {
-		return err
-	}
 	fileData, err := ioutil.ReadFile(filename)
 	if err != nil {
 		return err