BROOKLYN-212: AutoScaling doesn’t retry if InsufficientCapacity

BROOKLYN-212: AutoScaling doesn’t retry if InsufficientCapacity

- Adds Resizable.InsufficientCapacityException, thrown by
  Resizable.resize() if could not grow at all.
- DynamicCluster catches NoMachinesAvailableException, and rethrows
  as InsufficientCapacityException in resize().
- AutoScalerPolicy catches InsufficientCapacityException, and sets
  insufficientCapacityHighWaterMark to record the max size it can get
  to. Does not try again to resize above that, unless the highWaterMark
  is explicitly cleared by reconfiguring that config value.
- Tests:
  - Changes TestCluster to include history of sizes and desiredSizes
  - Changes TestCluster, so can throw InsufficientCapacityException
    when gets to a particular size.
  - Test for DynamicCluster throwing InsufficientCapacityException
  - Test for AutoScalerPolicyMetricTest, to not resize above the failure
    level again.
  - Test for AutoScalerPolicyNoMoreMachinesTest, for when BYON location
    has run out of machines in a DynamicCluster.