track device block size when creating an Md RAID (bsc#1164295)
track device block size when creating an Md RAID (bsc#1164295)

It seems the RAID device will use the maximum block size of the underlying
disk devices.

openSUSE/libstorage-bgl-eval,openSUSE/libstorage-bgl-eval,openSUSE/libstorage-bgl-eval,aschnell/libstorage-bgl-eval,openSUSE/libstorage-bgl-eval,aschnell/libstorage-bgl-eval,openSUSE/libstorage-bgl-eval,aschnell/libstorage-bgl-eval,aschnell/libstorage-bgl-eval,aschnell/libstorage-bgl-eval