LU-18171 tests: Update sanity-sec for IPv6

LU-18171 tests: Update sanity-sec for IPv6

sanity-sec test 55 and 64 need to be updated to specify a netmask for
IPv6 client NIDs.

Test-Parameters: trivial
Test-Parameters: testlist=sanity-sec env=ONLY="55 64",FORCE_LARGE_NID=true,LOAD_MODULES_REMOTE=true
Fixes: 0ea23e0194 ("LU-13307 nodemap: have nodemap_add_member support large NIDs")
Signed-off-by: Chris Horn <chris.horn@hpe.com>
Change-Id: I64680befee7c1049df1ceecb8a3bd5a16671f111
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56157
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>