Add AIX support for LVs and Filesystems


This PR adds support for AIX logical volumes and creation and resizing of filesystems on AIX.  The filesystem type has many new attributes currently only supported on AIX, the idea is that in time this model can be used for Linux platforms too instead of just passing a whole bunch of OS specific data in the options attribute.  Until these attributes are handled by the lvm provider they are AIX only.

Also re-indented the filesystem type to conventional 2 space tabs.