Initializing driver with a URI and slaveOk=false defaults reads to secondary

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      There's a bug in com.mongodb.ConnectionString.java in the Java Driver. 

              // handle legacy slaveok settings
        if (optionsMap.containsKey("slaveok") && !optionsMap.containsKey("readpreference")) {
            optionsMap.put("readpreference", asList("secondaryPreferred"));
        }

      This check is assuming that if slaveok is set that it was set to slaveOk=true.

      Here's the commit that introduced this bug: https://github.com/mongodb/mongo-java-driver/commit/edb6952fd76ca9eba72b5f018717cb58c0745c0f

              Assignee:
              Jeffrey Yemin
              Reporter:
              Michael Everett
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