LU-17151 tests: increase memcg limit on x86_64

LU-17151 tests: increase memcg limit on x86_64

The x86_64 memcg limit of 384MB is quite small, often resulting in
failures on sanity/test_411b in some exterme situations when test
in VM environments.

To avoid the failures, we increase the limit with 1024MiB on both
x86_64 and arm systems.

And we also skip the test if the available OST storage space are
not enough.

Test-Parameters: trivial testlist=sanity env=ONLY=411b,ONLY_REPEAT=100
Signed-off-by: Qian Yingjin <qian@ddn.com>
Change-Id: I1064a4c2523b8d3e721f9712c17b829a9b1796dc
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55568
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>