LU-11156 scrub: skip project quota inode

LU-11156 scrub: skip project quota inode

Error happened when scrub try to process project quota inode.
Scrub thinks that it is IGIF, because it has no lma fid. And it starts
to create O/inum/{LAST_ID,d0-d31}, and fails with not enough credits.
The project quota inode s_prj_quota_inum should be skipped
from scrub iteration.

Lustre-change: https://review.whamcloud.com/32829
Lustre-commit: d01fc74e8a347a0c8ebfcf92a49c7f71809cd0ad

Signed-off-by: Alexander Boyko <c17825@cray.com>
Cray-bug-id: LUS-6197
Change-Id: I38c347377a1c648ac3dd3e3ff4c4d65ee34cde39
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Wang Shilong <wshilong@whamcloud.com>
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/33971
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>