Merge branch 'sh-bump-rugged-to-0.27.1' into 'master'

Bump rugged to 0.27.1 for security fixes

See merge request gitlab-org/gitlab-ce!19222

Gemfile.lock

@@ -800,7 +800,7 @@ GEM
     rubyzip (1.2.1)
     rufus-scheduler (3.4.0)
       et-orbi (~> 1.0)
-    rugged (0.27.0)
+    rugged (0.27.1)
     safe_yaml (1.0.4)
     sanitize (2.1.0)
       nokogiri (>= 1.4.4)