Upgrade Gitaly to 1.9.0

This upgrade moves logic from gitlab-rails to Gitaly, which allowed code
removal too.

GITALY_SERVER_VERSION

-1.7.0
+1.9.0

lib/gitlab/git/object_pool.rb

@@ -23,13 +23,6 @@ module Gitlab
       end
 
       def link(to_link_repo)
-        remote_name = to_link_repo.object_pool_remote_name
-        repository.set_config(
-          "remote.#{remote_name}.url" => relative_path_to(to_link_repo.relative_path),
-          "remote.#{remote_name}.tagOpt" => "--no-tags",
-          "remote.#{remote_name}.fetch" => "+refs/*:refs/remotes/#{remote_name}/*"
-        )
-
         object_pool_service.link_repository(to_link_repo)
       end
 

spec/lib/gitlab/git/object_pool_spec.rb

@@ -56,16 +56,11 @@ describe Gitlab::Git::ObjectPool do
   describe '#link' do
     let!(:pool_repository) { create(:pool_repository, :ready) }
 
-    context 'when no remotes are set' do
+    context 'when linked for the first time' do
       it 'sets a remote' do
+        expect do
           subject.link(source_repository)
-
-        repo = Gitlab::GitalyClient::StorageSettings.allow_disk_access do
-          Rugged::Repository.new(subject.repository.path)
-        end
-
-        expect(repo.remotes.count).to be(1)
-        expect(repo.remotes.first.name).to eq(source_repository.object_pool_remote_name)
+        end.not_to raise_error
       end
     end
 
@@ -75,14 +70,9 @@ describe Gitlab::Git::ObjectPool do
       end
 
       it "doesn't raise an error" do
+        expect do
           subject.link(source_repository)
-
-        repo = Gitlab::GitalyClient::StorageSettings.allow_disk_access do
-          Rugged::Repository.new(subject.repository.path)
-        end
-
-        expect(repo.remotes.count).to be(1)
-        expect(repo.remotes.first.name).to eq(source_repository.object_pool_remote_name)
+        end.not_to raise_error
       end
     end
   end