RUBY-1122 Account for server description race condition with higher heartbeat frequency

Author: estolfo

spec/mongo/server/connection_spec.rb

@@ -113,7 +113,8 @@
             TEST_OPTIONS.merge(
               :user => 'notauser',
               :password => 'password',
-              :database => TEST_DB )
+              :database => TEST_DB,
+              :heartbeat_frequency => 30)
           )
         end