Update ResourceManager::Policy

Add de-duplication of role members.

[refs googleapis#2091]

google-cloud-resource_manager/lib/google/cloud/resource_manager/policy.rb

@@ -169,7 +169,7 @@ def to_gapi
               next if roles[role_name].empty?
               API::Binding.new(
                 role: role_name,
-                members: roles[role_name]
+                members: roles[role_name].uniq
               )
             end
           )

google-cloud-resource_manager/test/google/cloud/resource_manager/policy_test.rb

@@ -35,6 +35,22 @@
     role.frozen?.must_equal false
   end
 
+  describe :to_gapi do
+    it "creates a Google::Apis::CloudresourcemanagerV1::Policy object with the equivalent de-duped roles" do
+      # Add a duplicate entry.
+      existing_role, existing_members = policy.roles.first
+      policy.add(existing_role, existing_members.first)
+
+      gapi_policy = policy.to_gapi
+
+      gapi_policy.class.must_equal  Google::Apis::CloudresourcemanagerV1::Policy
+      gapi_policy.bindings.size.must_equal policy.roles.size
+      gapi_policy.bindings.each do |binding|
+        binding.members.sort.must_equal policy.roles[binding.role].uniq.sort
+      end
+    end
+  end
+
   describe :from_gapi do
     it "creates from a typical Google::Apis::CloudresourcemanagerV1::Policy object" do
       gapi = Google::Apis::CloudresourcemanagerV1::Policy.new(

google-cloud-storage/test/google/cloud/storage/policy_test.rb

@@ -36,7 +36,7 @@
   end
 
   describe :to_gapi do
-    it "creates a Google::Apis::StorageV1::Policy object with the equivalent deduped roles" do
+    it "creates a Google::Apis::StorageV1::Policy object with the equivalent de-duped roles" do
       # Add a duplicate entry.
       existing_role, existing_members = policy.roles.first
       policy.add(existing_role, existing_members.first)