CLOUDSTACK-4132 current dnsmasq config does not allow guest virtual machines(clients) to update its hostnames with a DNS server

Introducing the option dhcp-client-update fails if the dnsmasq version is less than 2.6 (like in older templates).
Added a check for the version in cloud-early-config. will add dhcp-client-update option in the config file only
if the dnsmasq version is 2.6 and above.

Signed-off-by: Jayapal <jayapal@apache.org>
CLOUDSTACK-4385 : [ZWPS]Across the cluster live migration of VM on zone wide primary storage pool fails

If all the VM's volumes are on zone wide primary storage pool then live migration of the VM would not involve storage migration. Hence MigrateVM API would be called against MigrateVMWithVolume. So far PrepareForMigrationCommand handled scenarios of VM moving across hosts within a cluster, but with zone wide primary storage in picture this command need to handle scenarios of VM moving across clusters. Try to find the VM in datacenter if not found within cluster.

Signed-off-by: Sateesh Chodapuneedi <sateesh@apache.org>