Fix "Config file not found and was unable to create" on new gosdn repo environment

If the gosdn repository is freshly cloned and the CLI is used, following error message appears:
ERRO[0005] Config file not found and was unable to create, error: open ./config/.gosdnc.toml: permission denied
To fix this, the permissions have to be (slightly) changed from 0600 to 0700 in gosdn/cli/cmd/root.go.