hs-test: experimental support for multiple test instances

- appending PID to interface and container names
- added a check for used IP addresses
- TestEnvoyProxyHttpTcp and TestTcpWithLoss are broken when running multiple instances

Type: test

Change-Id: Ib917079ec7cf851dee59ff9c67e74f48c7c5e3c6
Signed-off-by: adrianvillin <avillin@cisco.com>
diff --git a/extras/hs-test/raw_session_test.go b/extras/hs-test/raw_session_test.go
index 386f9bc..670ed58 100644
--- a/extras/hs-test/raw_session_test.go
+++ b/extras/hs-test/raw_session_test.go
@@ -14,7 +14,7 @@
 }
 
 func (s *VethsSuite) testVppEcho(proto string) {
-	serverVethAddress := s.netInterfaces[serverInterfaceName].ip4AddressString()
+	serverVethAddress := s.getInterfaceByName(serverInterfaceName).ip4AddressString()
 	uri := proto + "://" + serverVethAddress + "/12344"
 
 	echoSrvContainer := s.getContainerByName("server-app")