hs-test: fix LDPreloadIperfVppTest

- fixed ldpreload path (debug build)

Type: test

Change-Id: Ib2ab58b32ffd87a78189464b599f7bbc4f05c175
Signed-off-by: Adrian Villin <avillin@cisco.com>
diff --git a/extras/hs-test/infra/hst_suite.go b/extras/hs-test/infra/hst_suite.go
index 46aede7..a6ba146 100644
--- a/extras/hs-test/infra/hst_suite.go
+++ b/extras/hs-test/infra/hst_suite.go
@@ -32,6 +32,7 @@
 var IsVppDebug = flag.Bool("debug", false, "attach gdb to vpp")
 var NConfiguredCpus = flag.Int("cpus", 1, "number of CPUs assigned to vpp")
 var VppSourceFileDir = flag.String("vppsrc", "", "vpp source file directory")
+var IsDebugBuild = flag.Bool("debug_build", false, "some paths are different with debug build")
 var SuiteTimeout time.Duration
 
 type HstSuite struct {