Script to add a new partition to a devmapper volume group

Dwellers uses CentOS 7, and so use device mapper to manage
partitions.

Adds a new partition to a device mapper volume group

Usage: new-partition <device> <volume group>

<logical volume name> [mounting point]

Example: new-partition /dev/sdb1 centos_dwellers wharf

If mounting point is omitted, disk is mounted in /<logical volume name>