Support mount configuration options

[omallo]

Right now, the driver does not support any mount configuration options. As such, the mount command executed by the driver is always the following:

mount /dev/disk/by-id/scsi-0DO_Volume_<volname> /mnt/dostorage/<volname>

Support for the following mount configuration options might be added to the driver:

• the filesystem type (-t option of the mount command)
• the mount options (-o option of the mount command)

Furthermore, the driver does not support volumes partitioned with a GPT and subpartitions as described here. It should be checked how such volumes can be supported and whether the driver should also support multiple partitions.