LU-15089 tests: allow enough time to create tcp connections

LU-15089 tests: allow enough time to create tcp connections

Allow enough time to create tcp connections before counting them
when testing socklnd conns_per_peer setting in sanity-lnet test_230

Test-Parameters: trivial testlist=sanity-lnet
Fixes: a5cbe7883db6 ("LU-12815 socklnd: allow dynamic setting of conns_per_peer")
Signed-off-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Change-Id: Ia3e25de157da03d6129b108c1af9632a8faf8efd
Reviewed-on: https://review.whamcloud.com/45331
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Tested-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>