LU-13149 tests: change sanityn 103 facet value

The facet name input to lustre_version_code() in sanityn
test 103 should be 'ost1' not a variable '$ost1'.  Let's
replace this call with the $OST1_VERSION variable.

Fixes: 2548cb9e

 ("LU-11670 osc: glimpse - search for active lock")
Test-Parameters: trivial
Test-Parameters: serverversion=2.10.8 serverdistro=el7.6 env=ONLY=103 testlist=sanityn
Signed-off-by: James Nunez <jnunez@whamcloud.com>
Change-Id: Ib7426f78210c9b32ba53c46ba5f08faeb3ea8ec5
Reviewed-on: https://review.whamcloud.com/38847

Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Wei Liu <sarah@whamcloud.com>

lustre/tests/sanityn.sh

@@ -4595,7 +4595,7 @@ run_test 102 "Test open by handle of unlinked file"
 # Compare file size between first & second mount, ensuring the client correctly
 # glimpses even with unused speculative locks - LU-11670
 test_103() {
-	[ $(lustre_version_code $ost1) -lt $(version_code 2.10.50) ] &&
+	[ $OST1_VERSION -lt $(version_code 2.10.50) ] &&
 		skip "Lockahead needs OST version at least 2.10.50"
 
 	local locktest=23