HyperV nova driver enhancement to create highly available instances

This blueprint creating-hyperv-ha-instances allows creating of highly
available instances in a HyperV hosts that are in a failover cluster.
Highly available virtual machines are defined by the the document
http://technet.microsoft.com/en-us/library/cc967323.aspx as
'Highly available virtual machines, also known as HAVMs, can easily be
migrated to a different virtual machine host in a failover cluster to provide
continuing service when their current host needs maintenance. If their current
host fails, the HAVMs automatically migrate to a different host in the cluster
through a process known as failover.'