Interactive SBD process on looks mess

[liangxin1300]

SBD is already configured to use /dev/sda5 - overwrite (y/n)? y
Path to storage device (e.g. /dev/disk/by-id/...), or "none" for diskless sbd, use ";" as separator for multi path []/dev/sda6;/dev/sda7
SBD is already configured to use /dev/sda6 - overwrite (y/n)? n
WARNING: All data on /dev/sda7 will be destroyed!
Are you sure you wish to use this device (y/n)? y

There are two levels of overwriting for SBD:

1. device name, the string value of SBD_DEVICE in sysconfig/sbd; if detected there is a value configured for SBD_DEVICE, ask the user whether to overwrite this value
2. the device metadata; if detected there exists metadata for a specified device, ask the user whether to overwrite the metadata

The info message should distinguish these two concepts and the process should be improved

I will first improve this in #1491 and then see how to backport