LU-13427 lmv: do not print MDTs that are inactive

LU-13427 lmv: do not print MDTs that are inactive

Have lmv return -EAGAIN instead of -ENODATA for unconfigured MDTs.
That avoids "lfs df -v" from printing a long list of invalid MDTs
when trying to get the target state for non-rotational devices.

Add test for "lfs df -v" printing nonrotational state, as well as
limiting the reported OST and MDT to configured devices.

Fixes: 4c76eb64a9ff ("LU-8920 utils: don't print deactivated OSTs in 'lfs df')
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Ia3dcf85f4cf52caa39848f0f6ed8d47d42ce7057
Reviewed-on: https://review.whamcloud.com/38165
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Ben Evans <beevans@whamcloud.com>
Reviewed-by: Mike Pershin <mpershin@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>