LU-10848 test: wait to process inodes in phase2

LU-10848 test: wait to process inodes in phase2

In test_8 of sanity-lfsck, the "LF_INCONSISTENT" flag was set
when processing the inodes with corrupted LinkEA in phase2,
LFSCK could have no chance to process it yet because of the delay
OBD_FAIL_LFSCK_DELAY3.

Lustre-change: https://review.whamcloud.com/44658
Lustre-commit: 4efcd6f9b8f9bb768c6167a880777413950619c4

Test-Parameters: trivial testlist=sanity-lfsck env=ONLY=8,ONLY_REPEAT=20
Change-Id: Id414728c998d527fbc27f877c6d31dcedcc12457
Signed-off-by: Hongchao Zhagn <hongchao@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/45013
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>