Merge branch 'update-sidekiq' into 'master'

update sidekiq 5.0 -> 5.1

See merge request gitlab-org/gitlab-ce!18765

Gemfile

@@ -160,7 +160,7 @@ gem 'state_machines-activerecord', '~> 0.5.1'
 gem 'acts-as-taggable-on', '~> 5.0'
 
 # Background jobs
-gem 'sidekiq', '~> 5.0'
+gem 'sidekiq', '~> 5.1'
 gem 'sidekiq-cron', '~> 0.6.0'
 gem 'redis-namespace', '~> 1.5.2'
 gem 'sidekiq-limit_fetch', '~> 3.4', require: false

Gemfile.lock

@@ -846,11 +846,11 @@ GEM
       rack
     shoulda-matchers (3.1.2)
       activesupport (>= 4.0.0)
-    sidekiq (5.0.5)
+    sidekiq (5.1.3)
       concurrent-ruby (~> 1.0)
       connection_pool (~> 2.2, >= 2.2.0)
       rack-protection (>= 1.5.0)
-      redis (>= 3.3.4, < 5)
+      redis (>= 3.3.5, < 5)
     sidekiq-cron (0.6.0)
       rufus-scheduler (>= 3.3.0)
       sidekiq (>= 4.2.1)
@@ -1177,7 +1177,7 @@ DEPENDENCIES
   settingslogic (~> 2.0.9)
   sham_rack (~> 1.3.6)
   shoulda-matchers (~> 3.1.2)
-  sidekiq (~> 5.0)
+  sidekiq (~> 5.1)
   sidekiq-cron (~> 0.6.0)
   sidekiq-limit_fetch (~> 3.4)
   simple_po_parser (~> 1.1.2)