Set info about NApp.

        Args:
            user (str): NApps Server username.
            napp (str): NApp name.
            version (str): NApp version.

def set_napp(self, user, napp, version=None):
        """Set info about NApp.

        Args:
            user (str): NApps Server username.
            napp (str): NApp name.
            version (str): NApp version.
        """
        self.user = user
        self.napp = napp
        self.version = version or 'latest'