Removing googleapis-common-protos from deps in non-core packages. (#4098)

* Removing `googleapis-common-protos` from deps in non-`core` packages.

Also

- removing `grpcio` from non-`core` packages.
- manually specifying the `grpcio` dep in core (rather than getting
  it from `googleapis-common-protos[grpc]`)

* Making `grpc` an extra for `core`.

* Adding `googleapis-common-protos` back to `videointelligence`.

Author: dhermes

packages/google-cloud-core/setup.py

@@ -51,7 +51,7 @@
 
 
 REQUIREMENTS = [
-    'googleapis-common-protos[grpc] >= 1.5.3, < 2.0dev',
+    'googleapis-common-protos >= 1.5.3, < 2.0dev',
     'protobuf >= 3.0.0',
     'google-auth >= 0.4.0, < 2.0.0dev',
     'requests >= 2.18.0, < 3.0.0dev',
@@ -61,6 +61,7 @@
 
 EXTRAS_REQUIREMENTS = {
     ':python_version<"3.2"': ['futures >= 3.0.0'],
+    'grpc': ['grpcio >= 1.2.0, < 1.6dev'],
 }
 
 setup(