private void awaitCacheClose() {
    await().until(() -> !cacheExists.get());
  }
Create three PRs on a VM, named region1, region2, and region3. The colocated with attribute
describes which region region3 should be colocated with.
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/partitioned/colocation/ModifyColocationIntegrationTest.java