[PATCH 00/14] Add lvm lv properties and lvm2app interfaces for pv/vg/lv.

This patchset is adds lv properties for lvm2app, and adds
the lvm2app interfaces and interactive tests to exercise
the interface.

A few attributes require more complex refactoring and are thus still
missing:
1. readahead: lv_read_ahead, lv_kernel_read_ahead
2. percents: snap_percent and copy_percent

All vg and pv properties and most lv properties may now be queried
with this patchset.