Moved Drivetrain from y2017 python to frc971

Change-Id: If931cf988d2615acc286d288fc0e5c9e7e3a5b90
diff --git a/frc971/control_loops/python/BUILD b/frc971/control_loops/python/BUILD
index b1897e0..4b25bb4 100644
--- a/frc971/control_loops/python/BUILD
+++ b/frc971/control_loops/python/BUILD
@@ -40,3 +40,27 @@
   ],
   restricted_to = ['//tools:k8'],
 )
+
+py_library(
+  name = 'drivetrain',
+  srcs = [
+    'drivetrain.py',
+  ],
+  deps = [
+    ':controls',
+  ],
+  restricted_to = ['//tools:k8'],
+)
+
+py_library(
+  name = 'polydrivetrain',
+  srcs = [
+    'polydrivetrain.py',
+  ],
+  deps = [
+    ':controls',
+    ':drivetrain',
+    '//external:python-glog',
+  ],
+  restricted_to = ['//tools:k8'],
+)