LU-14692 tests: allow FID_SEQ_NORMAL for MDT0000

LU-14692 tests: allow FID_SEQ_NORMAL for MDT0000

Fix the tests asssuming objects created for MDT0000
always have a seq number of 0, to prepare for
deprecating IDIF sequence.

Fix sanity test_312 on ZFS to properly identify which
OST the object was created on, and re-enable it.

Test-Parameters: testlist=sanity env=ONLY="39r 312"
Test-Parameters: testlist=sanity-scrub env=ONLY=19
Test-Parameters: testlist=sanity-sec env=ONLY=37
Change-Id: I4bffabe25a6f84cdba760aabea1da3429715a283
Signed-off-by: Li Dongyang <dongyangli@ddn.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/46293
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>