Feature: removal of calls to updateVmInSpm/removeVmInSpm - introduce of OvfAutoUpdater Reason: vm/template configurations (including disks info) are stored on the master storage domain for backup purposes and also to provide the abillity to run VMs without having a running engine/db. Currently ovf update is done synchronously when performing various operations on vms/templates - update, save, adding/removing a disk, etc. What's more, currently updating the ovf (updateVM vdsm call) is usually done within a transcation. The idea behined OvfAutoUpdater is to perform a batch ovf update operations that aggregate all hanging updates per data center. These updates will be done in specifed time intervals which will reduce XML-RPC calls and will enable the removal of this syncronous vdsm call from all over the code.