Use pyobmc package

No functional changes here.  Just module/package namespace updates
to use the pyobmc library.  Removed code duplicated by pyobmc.
diff --git a/setup.py b/setup.py
index bfbf3fc..7185072 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,5 @@
 from distutils.core import setup
-setup(name='OpenBMCMapper',
+setup(name='phosphor-mapper',
       version='1.0',
-      py_modules=['OpenBMCMapper'],
       scripts=['phosphor-mapper']
       )