GEODE-6269: Extract StatisticsRegistry from InternalDistributedSystem

[demery-pivotal]

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Please review @kirklund @galen-pivotal @mhansonp

[kirklund]

The UpgradeTests have a bunch of failures that appear to be in just the Lucene tests and caused by the old version not having the method GemFireCacheImpl.getStatisticsRegistry(). I think this is test code blowing up and not product code. I think the test is trying to get some statistics to look at and is using test code that only works against the new version of product code. So we may need to change test code to fix this.

[kirklund]

This is some pretty bad code in LuceneSearchWithRollingUpgradeDUnit.java. Apparently the line that fails is the one with getMethod("getStatisticsRegistry") and it looks like we incorrectly changed it from "getDistributedSystem":

  private static void assertVersion(Object cache, short ordinal) throws Exception {
    Class idmClass = Thread.currentThread().getContextClassLoader()
        .loadClass("org.apache.geode.distributed.internal.membership.InternalDistributedMember");
    Method getDSMethod = cache.getClass().getMethod("getStatisticsRegistry");
    getDSMethod.setAccessible(true);
    Object ds = getDSMethod.invoke(cache);

    Method getDistributedMemberMethod = ds.getClass().getMethod("getDistributedMember");
    getDistributedMemberMethod.setAccessible(true);
    Object member = getDistributedMemberMethod.invoke(ds);
    Method getVersionObjectMethod = member.getClass().getMethod("getVersionObject");
    getVersionObjectMethod.setAccessible(true);
    Object thisVersion = getVersionObjectMethod.invoke(member);
    Method getOrdinalMethod = thisVersion.getClass().getMethod("ordinal");
    getOrdinalMethod.setAccessible(true);
    short thisOrdinal = (Short) getOrdinalMethod.invoke(thisVersion);
    if (ordinal != thisOrdinal) {
      throw new Error(
          "Version ordinal:" + thisOrdinal + " was not the expected ordinal of:" + ordinal);
    }
  }