Allow preprovision capacity on partially filled hosts

Adds new functionality that can be disabled by setting the
compact-preprovision-capacity flag to false.

preprovision-capacity can be satisfied by hosts with spare resources.  The
DynamicProvisioningMaintainer does this as follows:
 1. For each cluster in preprovision-capacity, try to
    a. allocate the cluster using NodePrioritizer
    b. If there is a deficit, provision the deficit with HostProvisioner, which
       may provision larger shared hosts depending on shared-hosts, and retry
       (1) from the first cluster again.
    c. Otherwise, pretend the nodes are allocated and go to next cluster.
 2. All of preprovision-capacity was successfully allocated, and empty hosts
    are therefore excess that can be deprovisioned.

0 files changed, 0 insertions, 0 deletions