LU-11558 tests: re-enable conf-sanity t32_verify_quota()

LU-11558 tests: re-enable conf-sanity t32_verify_quota()

Since patch https://review.whamcloud.com/28020 "LU-3285 test: add
Data-on-MDT tests and fixes" landed the call to t32_verify_quota()
from conf-sanity.sh t32_test() has been removed, and (I'd guess)
that we are no longer verifying that quota is still working
correctly after an upgrade.

It is unclear why this check was removed. Return it back to the
code so that we resume testing that quota is working after an
upgrade from an old disk format.

Test-Parameters: trivial testlist=conf-sanity
Test-Parameters: fstype=zfs testlist=conf-sanity
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Ia6bab4907e7cb4e6e5581a6a072cc51ab53ebbe5
Reviewed-on: https://review.whamcloud.com/33423
Reviewed-by: Mike Pershin <mpershin@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Li Dongyang <dongyangli@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>