Add boilerplate comments for inline unit test harness

Change-Id: Ie9b727ba8e4a2f9733ec9d5e183da9ebcd5b4071
diff --git a/drivers/CiscoCatalyst.py b/drivers/CiscoCatalyst.py
index b537aa0..16f47db 100644
--- a/drivers/CiscoCatalyst.py
+++ b/drivers/CiscoCatalyst.py
@@ -616,6 +616,10 @@
 
 if __name__ == "__main__":
 
+    # Simple test harness - exercise the main working functions above to verify
+    # they work. This does *NOT* test really disruptive things like "save
+    # running-config" and "reload" - test those by hand.
+
     import optparse
 
     switch = 'vlandswitch01'
diff --git a/drivers/CiscoSX300.py b/drivers/CiscoSX300.py
index cc12584..3aed9ca 100644
--- a/drivers/CiscoSX300.py
+++ b/drivers/CiscoSX300.py
@@ -560,6 +560,10 @@
 if __name__ == "__main__":
 #    p = CiscoSX300('10.172.2.52', 23)
 
+    # Simple test harness - exercise the main working functions above to verify
+    # they work. This does *NOT* test really disruptive things like "save
+    # running-config" and "reload" - test those by hand.
+
     import optparse
 
     switch = 'vlandswitch02'
diff --git a/drivers/Dummy.py b/drivers/Dummy.py
index 72f31c4..f630184 100644
--- a/drivers/Dummy.py
+++ b/drivers/Dummy.py
@@ -241,6 +241,10 @@
 
 if __name__ == "__main__":
 
+    # Simple test harness - exercise the main working functions above to verify
+    # they work. This does *NOT* test really disruptive things like "save
+    # running-config" and "reload" - test those by hand.
+
     import optparse
 
     switch = 'dummy-48'
diff --git a/drivers/NetgearXSM.py b/drivers/NetgearXSM.py
index b3241d5..f8ba8a5 100644
--- a/drivers/NetgearXSM.py
+++ b/drivers/NetgearXSM.py
@@ -664,6 +664,10 @@
 
 if __name__ == "__main__":
 
+    # Simple test harness - exercise the main working functions above to verify
+    # they work. This does *NOT* test really disruptive things like "save
+    # running-config" and "reload" - test those by hand.
+
     import optparse
 
     switch = 'vlandswitch05'
diff --git a/drivers/TPLinkTLSG2XXX.py b/drivers/TPLinkTLSG2XXX.py
index f33b19e..5213d10 100644
--- a/drivers/TPLinkTLSG2XXX.py
+++ b/drivers/TPLinkTLSG2XXX.py
@@ -584,6 +584,11 @@
             self.connection.expect(text)
 
 if __name__ == "__main__":
+
+    # Simple test harness - exercise the main working functions above to verify
+    # they work. This does *NOT* test really disruptive things like "save
+    # running-config" and "reload" - test those by hand.
+
     import optparse
 
     switch = '10.172.2.50'