LU-17057 tests: Fix "...endpoint shutdown" under sanity-sec

LU-17057 tests: Fix "...endpoint shutdown" under sanity-sec

This patch fixes test_0 failing with "Cannot send after
transport endpoint shutdown" by introducing wait_ssk()
in sec_setup() to deterministicly applied SSK flavor.

Lustre-change: https://review.whamcloud.com/54311
Lustre-commit: 24ae2519acd15691d9e319ffc8675cee60529b95

Test-Parameters: trivial mdscount=2 mdtcount=4 osscount=1 ostcount=8 clientcount=2 testlist=sanity-sec env=SHARED_KEY=true,ONLY=0
Test-Parameters: trivial mdscount=2 mdtcount=4 osscount=1 ostcount=8 clientcount=2 testlist=sanity-sec env=SHARED_KEY=true,ONLY=0
Test-Parameters: trivial mdscount=2 mdtcount=4 osscount=1 ostcount=8 clientcount=2 testlist=sanity-sec env=SHARED_KEY=true,ONLY=0
Test-Parameters: trivial mdscount=2 mdtcount=4 osscount=1 ostcount=8 clientcount=2 testlist=sanity-sec env=SHARED_KEY=true,ONLY=0
Test-Parameters: trivial mdscount=2 mdtcount=4 osscount=1 ostcount=8 clientcount=2 testlist=sanity-sec env=SHARED_KEY=true,ONLY=0
Test-Parameters: trivial mdscount=2 mdtcount=4 osscount=1 ostcount=8 clientcount=2 testlist=sanity-sec env=SHARED_KEY=true,ONLY=0
Test-Parameters: trivial mdscount=2 mdtcount=4 osscount=1 ostcount=8 clientcount=2 testlist=sanity-sec env=SHARED_KEY=true,ONLY=0
Test-Parameters: trivial mdscount=2 mdtcount=4 osscount=1 ostcount=8 clientcount=2 testlist=sanity-sec env=SHARED_KEY=true,ONLY=0
Test-Parameters: trivial mdscount=2 mdtcount=4 osscount=1 ostcount=8 clientcount=2 testlist=sanity-sec env=SHARED_KEY=true,ONLY=0
Test-Parameters: trivial mdscount=2 mdtcount=4 osscount=1 ostcount=8 clientcount=2 testlist=sanity-sec env=SHARED_KEY=true,ONLY=0
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: Ia14021ab82913507df02dbb5a12c8596663f15d9
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/54555
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>