RUBY-1133 Clean up max staleness spec
RUBY-1133 Clean up max staleness spec

saghm/mongo-ruby-driver,estolfo/mongo-ruby-driver,saghm/mongo-ruby-driver,kay-kim/mongo-ruby-driver,mongodb/mongo-ruby-driver,mongodb/mongo-ruby-driver,mongodb/mongo-ruby-driver,jonhyman/mongo-ruby-driver,kay-kim/mongo-ruby-driver,estolfo/mongo-ruby-driver,jonhyman/mongo-ruby-driver