Update tests for aether pods

- Update test for QA-POD
- SRStaging for testing connecting to Staging pod
- Add some functions for a kubernetes deployed cluster
- Connect to ONOS nodes with kubernetes
- Add option to connect to components through jump hosts
- Fixes for installing ONOS in custom locations
- Invoke python2 instead of python
- If using an ssh agent, also use that for pexpect ssh sessions,
  E.G. Jenkins initiated tests

Change-Id: I1fc345c8eab60a5b00c17e6ed677a63489a74a19
diff --git a/TestON/tests/USECASE/SegmentRouting/SRDhcprelay/dependencies/SRDhcprelayTest.py b/TestON/tests/USECASE/SegmentRouting/SRDhcprelay/dependencies/SRDhcprelayTest.py
index d5f89a6..325af80 100644
--- a/TestON/tests/USECASE/SegmentRouting/SRDhcprelay/dependencies/SRDhcprelayTest.py
+++ b/TestON/tests/USECASE/SegmentRouting/SRDhcprelay/dependencies/SRDhcprelayTest.py
@@ -49,11 +49,14 @@
             if main.useBmv2:
                 # Translate configuration file from OVS-OFDPA to BMv2 driver
                 translator.bmv2ToOfdpa( main )  # Try to cleanup if switching between switch types
-                switchPrefix = main.params[ 'DEPENDENCY' ].get( 'switchPrefix', "bmv2" )
+                switchPrefix = main.params[ 'DEPENDENCY' ].get( 'switchPrefix', '' )
+                if switchPrefix is None:
+                    switchPrefix = ''
                 translator.ofdpaToBmv2( main, switchPrefix=switchPrefix )
             else:
                 translator.bmv2ToOfdpa( main )
-            run.loadJson( main )
+            if not main.persistentSetup:
+                run.loadJson( main )
             run.loadHost( main )
             if hasattr( main, 'Mininet1' ):
                 run.mnDockerSetup( main )