forked from rook/rook
As the `rookflex` volume plugin, the root command should be `rookflex` instead of `rook`, else we'll get below confusing message: ``` ...bin/#./rookflex help Rook Flex volume plugin Usage: rook [command] Available Commands: help Help about any command init Initialize the volume plugin mount Mounts the volume to the pod volume unmount Unmounts the pod volume ``` Signed-off-by: Dennis Chen <dennis.chen@arm.com>