Remove lvm-thin pool_size config option

[OpenStack Infra]

https://review.openstack.org/54771
commit 930f4b393af312b39b56ee00a5f5282010f4156b
Author: John Griffith <email address hidden>
Date: Thu Oct 31 10:14:57 2013 -0600

    Remove lvm-thin pool_size config option

    The pool_size config option when using thin LVM
    is never actually checked/honored. It's also unlikely
    that users will want to do something other than use the
    entire VG for their thin pool.

    Rather than have the unused option going forward let's
    remove it from the config and just go with the default
    behavior of utilizing the entire Cinder VG.

    For folks that would like to only use a portion of the
    VG for some reason, they can do an lvcreate pool on their
    own (just like we have them do for the VG itself) and get
    the same flexibility that way.

    This is done simply by:
    lvcreate -T -L ${size} ${vg-name}/${vg_name}-pool

    DocImpact

    Change-Id: I3ef2cde433b8dd775b1873a0d6df165dd1945d8c

[Andreas Jaeger (jaegerandi)]

This shows up only in the autogenerated tables and should be fixed with the next update.