Fix  python3.x compatibility for stable 2.0 branch

Change-Id: I958d02873e4ba76be72230365dff8e500fa31b3c
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/state.py b/lib/state.py
index 0aae066..78f4cf4 100755
--- a/lib/state.py
+++ b/lib/state.py
@@ -34,7 +34,11 @@
 import gen_cmd as gc
 import bmc_ssh_utils as bsu
 
-import commands
+try:
+    import commands
+except ImportError:
+    import subprocess
+
 from robot.libraries.BuiltIn import BuiltIn
 from robot.utils import DotDict