Unvendor cloudpickle

LICENSE

@@ -311,8 +311,6 @@ See project link for details.
       -> heron/tools/ui/resources/static/js/JSXTransformer.0.10.0.js
     autogen.sh
       -> config/autogen.sh
-    cloudpickle(https://github.com/cloudpipe/cloudpickle/blob/master/LICENSE)
-      -> heronpy/api/cloudpickle.py
     cpplint(https://github.com/cpplint/cpplint/blob/master/LICENSE)
       -> third_party/python/cpplint/cpplint.py
     d3(v3.4.11, https://github.com/d3/d3/blob/master/LICENSE)

heronpy/api/BUILD

@@ -9,6 +9,9 @@ pex_library(
     deps = [
         "//heronpy/proto:proto-py",
     ],
+    reqs = [
+        "cloudpickle~=1.5.0",
+    ],
 )
 
 # for egg production