tools: dm_partition_dev.sh detect block device without partition table
tools: dm_partition_dev.sh detect block device without partition table

Also add support for partition loopback devices(in which partition names
are different)

medallia/convoy,rancherio/rancher-volume,nickvanw/convoy,nickvanw/convoy,rancher/convoy,rancherio/rancher-volume,rancherio/volmgr,rancher/convoy,rancherio/rancher-volume,rancher/rancher-volume,rancherio/volmgr,rancher/rancher-volume,nickvanw/convoy,rancherio/volmgr,medallia/convoy,rancher/rancher-volume,rancher/convoy,medallia/convoy,jinuxstyle/convoy,jinuxstyle/convoy,jinuxstyle/convoy