roachtest: handle tables added in 19.2

Fixes #40662

Release justification: Test only.

Release note: None

pkg/cmd/roachtest/gossip.go

@@ -350,9 +350,14 @@ func runGossipRestartNodeOne(ctx context.Context, t *test, c *cluster) {
 	run(`ALTER DATABASE system %[1]s CONFIGURE ZONE %[2]s 'constraints: {"-rack=0"}'`)
 	run(`ALTER RANGE meta %[1]s CONFIGURE ZONE %[2]s 'constraints: {"-rack=0"}'`)
 	run(`ALTER RANGE liveness %[1]s CONFIGURE ZONE %[2]s 'constraints: {"-rack=0"}'`)
+	// TODO(andrei): Changing the constraints for the system tables shouldn't be
+	// needed given that we've changed them for the system zone. What's going on?
+	// #40921.
 	run(`ALTER TABLE system.jobs %[1]s CONFIGURE ZONE %[2]s 'constraints: {"-rack=0"}'`)
-	run(`ALTER TABLE system.replication_stats %[1]s CONFIGURE ZONE %[2]s 'constraints: {"-rack=0"}'`)
-	run(`ALTER TABLE system.replication_constraint_stats %[1]s CONFIGURE ZONE %[2]s 'constraints: {"-rack=0"}'`)
+	if t.IsBuildVersion("v19.2.0") {
+		run(`ALTER TABLE system.replication_stats %[1]s CONFIGURE ZONE %[2]s 'constraints: {"-rack=0"}'`)
+		run(`ALTER TABLE system.replication_constraint_stats %[1]s CONFIGURE ZONE %[2]s 'constraints: {"-rack=0"}'`)
+	}
 
 	var lastReplCount int
 	if err := retry.ForDuration(2*time.Minute, func() error {

pkg/cmd/roachtest/test.go

@@ -400,8 +400,6 @@ func (t *test) IsBuildVersion(minVersion string) bool {
 	return t.buildVersion.AtLeast(vers)
 }
 
-var _ = (*test)(nil).IsBuildVersion // avoid unused lint
-
 // teamCityEscape escapes a string for use as <value> in a key='<value>' attribute
 // in TeamCity build output marker.
 // Documentation here: https://confluence.jetbrains.com/display/TCD10/Build+Script+Interaction+with+TeamCity#BuildScriptInteractionwithTeamCity-Escapedvalues