LU-16632 tests: more margin of error for sanity/56xh

LU-16632 tests: more margin of error for sanity/56xh

Give sanity test_56xh more time to migrate files inside the
VMs before failing.

Also, fix a typo.

Lustre-change: https://review.whamcloud.com/50262
Lustre-commit: 36cbba150bce9e2890c8b462ec2ce4af2d6353a5

Test-Parameters: trivial testlist=sanity env=ONLY=56xh,ONLY_REPEAT=100
Fixes: 55968bfabe ("LU-13482 utils: bandwidth limit for lfs migrate")
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: If89c8c3ee113c8a14d4c0463c7bb79e353130c08
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/53086
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alex Deiter <alex.deiter@gmail.com>