Add capabilities reporting to ThinLVM driver

ThinLVM driver was missing the newly required capabilities reporting
and inheritance from the parent LVM driver doesn't work because the
capacity reporting methods between regular LVM and Thin LVM are not
compatible.

This patch add the basic requirements needed in the capabilities reporting
to make it usable by the filter scheduler.

Fixes bug: 1166572

Change-Id: I471dcc31d07516e71bcd2d3ae03e0405e0594697
Merge "Add capabilities reporting to ThinLVM driver"