The default value of maxUnavailable of daemonset is 1.
Sometimes the upgrade can be slow due to this setting.
So I add a parameter to change the value for rbd daemonset.
Signed-off-by: Shinya Hayashi <shinya-hayashi@cybozu.co.jp>
Co-authored-by: Toshikuni Fukaya <toshikuni-fukaya@cybozu.co.jp>
Co-authored-by: Yuji Ito <llamerada.jp@gmail.com>