Description of problem:
Export vm not pass ballooning parameter

Version-Release number of selected component (if applicable):
rhevm-3.4.3-1.2.el6ev.noarch

How reproducible:
Always

Steps to Reproduce:
1. Create new vm with ballooning <ballooning>false</ballooning>
2. Export it to export domain:
<vms>
<vm href= "/ovirt-engine/api/storagedomains/276e988c-1c60-425c-989d-96f126dbb35c/vms/59b3c853-6876-471e-abc4-c67d856c0d3c" id="59b3c853-6876-471e-abc4-c67d856c0d3c">
<actions>
<link href= "/ovirt-engine/api/storagedomains/276e988c-1c60-425c-989d-96f126dbb35c/vms/59b3c853-6876-471e-abc4-c67d856c0d3c/import" rel="import"/>
</actions>
<name>export_vm</name>
<description/>
<type>desktop</type>
<status>
<state>down</state>
</status>
<memory>1610612736</memory>
<cpu>
<topology sockets="1" cores="1"/>
<architecture>PPC64</architecture>
</cpu>
<cpu_shares>0</cpu_shares>
<os type="other_ppc64">
<boot dev="hd"/>
</os>
<high_availability>
<enabled>false</enabled>
<priority>0</priority>
</high_availability>
<display>
<type>vnc</type>
<monitors>1</monitors>
<single_qxl_pci>false</single_qxl_pci>
<allow_override>false</allow_override>
<smartcard_enabled>false</smartcard_enabled>
</display>
<template href= "/ovirt-engine/api/templates/00000000-0000-0000-0000-000000000000" id="00000000-0000-0000-0000-000000000000"/>
<storage_domain href= "/ovirt-engine/api/storagedomains/276e988c-1c60-425c-989d-96f126dbb35c" id="276e988c-1c60-425c-989d-96f126dbb35c"/>
<creation_time>2014-10-15T13:00:44.000+02:00</creation_time>
<origin>ovirt</origin>
<stateless>false</stateless>
<delete_protected>false</delete_protected>
<sso>
<methods>
<method id="GUEST_AGENT"/>
</methods>
</sso>
<initialization>
<regenerate_ssh_keys>false</regenerate_ssh_keys>
<nic_configurations/>
</initialization>
<placement_policy>
<affinity>migratable</affinity>
</placement_policy>
<memory_policy>
<guaranteed>1610612736</guaranteed>
</memory_policy>
<usb>
<enabled>false</enabled>
</usb>
<migration_downtime>-1</migration_downtime>
</vm>
</vms>

Actual results:
Not ballooning parameter under storage_domain_id/vms/vm_id

Expected results:
<ballooning>false</ballooning> appear under storage_domain_id/vms/vm_id, so when you import vm back via REST, ballooning set to default value true.

Additional info:
I put bug with severity urgent, because it prevent to import vm under ppc architecture(ballooning not supported)