epc_{amarisoft,srs}: Support selecting tgz based on run_node's run label

Change-Id: I90b8dab8bdc9980a7d2486d890cff183c07f1809
diff --git a/src/osmo_gsm_tester/obj/epc_srs.py b/src/osmo_gsm_tester/obj/epc_srs.py
index 2ee486f..e1d9f59 100644
--- a/src/osmo_gsm_tester/obj/epc_srs.py
+++ b/src/osmo_gsm_tester/obj/epc_srs.py
@@ -118,7 +118,7 @@
         self.process.launch()
 
     def configure(self):
-        self.inst = util.Dir(os.path.abspath(self.testenv.suite().trial().get_inst('srslte')))
+        self.inst = util.Dir(os.path.abspath(self.testenv.suite().trial().get_inst('srslte', self._run_node.run_label())))
         if not os.path.isdir(self.inst.child('lib')):
             raise log.Error('No lib/ in', self.inst)
         if not self.inst.isfile('bin', srsEPC.BINFILE):