Fix spec failures

app/models/storage_shard.rb

@@ -25,6 +25,6 @@ class StorageShard
   end
 
   def self.allowed_params
-    return %i(name path gitaly_address gitaly_token).freeze
+    %i(name path gitaly_address gitaly_token).freeze
   end
 end

spec/models/storage_shard_spec.rb

@@ -3,7 +3,7 @@ require 'spec_helper'
 describe StorageShard do
   describe '.current_shards' do
     it 'returns an array of StorageShard objects' do
-      shards = described_class.current_shards
+      shards = described_class.all
 
       expect(shards.count).to eq(Settings.repositories.storages.count)
       expect(shards.map(&:name)).to match_array(Settings.repositories.storages.keys)