Merge pull request #1 from 3scale/sentinels-addr-resolve-err

Fix error raised when trying to connect to a sentinel addr that cannot be resolved

lib/redis/client.rb

@@ -590,6 +590,10 @@ def sentinel_detect
                 return result
               end
             rescue BaseConnectionError
+            rescue RuntimeError => exception
+              # Needed because when the sentinel address cannot be resolved it
+              # raises this instead of "BaseConnectionError"
+              raise unless exception.message =~ /Name or service not known/
             ensure
               client.disconnect
             end