Have update meta update store versions automatically
Add to EndToEndZoneShrinkageTest

1. Fixed ZenStoreClient NPE related to uninitialized sysStore
2. Added EndToEnd test for zone shrinkage to verify:
  a. Clients work correctly and rebootstrap in time after cluster change
  b. Slops does stream out correctly from dropping servers
  c. Slops targeting dropping servers get dropped