Use moved iam.policy now at google.api_core.iam.policy (#6741)

* update references to iam to use api-core\
* Update dependency to api_core

Author: crwilcox

packages/google-cloud-bigtable/google/cloud/bigtable/instance.py

@@ -473,7 +473,7 @@ def test_iam_permissions(self, permissions):
     def _to_dict_from_policy_pb(self, policy):
         """Returns a dictionary representation of resource returned from
         the getIamPolicy API to use as parameter for
-        :meth: google.cloud.iam.Policy.from_api_repr
+        :meth: google.api_core.iam.Policy.from_api_repr
         """
         pb_dict = {}
         bindings = [

packages/google-cloud-bigtable/google/cloud/bigtable/policy.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from google.cloud.iam import Policy as BasePolicy
+from google.api_core.iam import Policy as BasePolicy
 from google.cloud._helpers import _to_bytes
 
 """IAM roles supported by Bigtable Instance resource"""

packages/google-cloud-bigtable/setup.py

@@ -29,7 +29,7 @@
 # 'Development Status :: 5 - Production/Stable'
 release_status = 'Development Status :: 4 - Beta'
 dependencies = [
-    'google-api-core[grpc] >= 1.4.1, < 2.0.0dev',
+    'google-api-core[grpc] >= 1.6.0, < 2.0.0dev',
     'google-cloud-core >= 0.28.0, <0.29dev',
     'grpc-google-iam-v1 >= 0.11.4, < 0.12dev',
 ]