tests: add support for worker awareness

VppTestCase now has vpp_worker_count property set to number of workers.
This can be overriden by child classes. Also overriden by
VPP_WORKER_CONFIG variable for legacy reasons.

Type: improvement
Change-Id: Ic328bacb9003ddf9e92815767653bd362aa7f086
Signed-off-by: Klement Sekera <ksekera@cisco.com>
diff --git a/test/template_ipsec.py b/test/template_ipsec.py
index f7becf0..62271d3 100644
--- a/test/template_ipsec.py
+++ b/test/template_ipsec.py
@@ -1217,7 +1217,7 @@
 
 class IpsecTun6HandoffTests(IpsecTun6):
     """ UT test methods for Tunnel v6 with multiple workers """
-    worker_config = "workers 2"
+    vpp_worker_count = 2
 
     def test_tun_handoff_66(self):
         """ ipsec 6o6 tunnel worker hand-off test """
@@ -1251,7 +1251,7 @@
 
 class IpsecTun4HandoffTests(IpsecTun4):
     """ UT test methods for Tunnel v4 with multiple workers """
-    worker_config = "workers 2"
+    vpp_worker_count = 2
 
     def test_tun_handooff_44(self):
         """ ipsec 4o4 tunnel worker hand-off test """