Update pkg_deb packages version#s to 1.4 (#648)

* Update pkg_deb packages version#s to 1.4

* Update BUILD

Author: Christopher Olston

tensorflow_serving/model_servers/BUILD

@@ -197,7 +197,7 @@ pkg_deb(
     homepage = "https://github.com/tensorflow/serving",
     maintainer = "TensorFlow Serving team",
     package = "tensorflow-model-server",
-    version = "undefined",  # Set when releasing a new version of TensorFlow Serving (e.g. 1.0.0).
+    version = "1.4.0",  # Set when releasing a new version of TensorFlow Serving (e.g. 1.0.0).
 )
 
 # Build with '-c opt'
@@ -208,5 +208,5 @@ pkg_deb(
     homepage = "https://github.com/tensorflow/serving",
     maintainer = "TensorFlow Serving team",
     package = "tensorflow-model-server-universal",
-    version = "undefined",  # Set when releasing a new version of TensorFlow Serving (e.g. 1.0.0).
+    version = "1.4.0",  # Set when releasing a new version of TensorFlow Serving (e.g. 1.0.0).
 )