Move make-instance-vol file into labs_lvm base class

In order to use labs_lvm::volume more than once, the make-instance-vol
must be installed by the module base class, otherwise one will get
Duplicate declaration: File[/usr/local/sbin/make-instance-vol] errors.

Change-Id: Id042f61127c78f8a80a90c37ba47eb466288a000