Fix mempool create parameters.

Signed-off-by: Matt Benjamin <matt@linuxbox.com>
Merge branch 'xio-rados-exp-noreg-buf-qs-upstream-ow-mdw' of https://github.com/linuxbox2/linuxbox-ceph into xio-rados-exp-noreg-buf-qs-upstream-ow-mdw

Signed-off-by: Matt Benjamin <matt@linuxbox.com>

Conflicts:
	src/msg/XioMessenger.cc
Remove unused registered mpool.

Signed-off-by: Matt Benjamin <matt@linuxbox.com>