Description of problem:
MOM does not get memory statistics from guest agent of VMs as in previous versions 3.4/3.3

Version-Release number of selected component (if applicable):
engine rhel6.5:
ovirt-3.5.0-beta2
ovirt-engine-setup-3.5.0-0.0.master.20140722232058.git8e1babc.el6.noarch

host: rhel6.5
mom-0.4.1-2.el6.noarch
vdsm-4.16.1-0.gita4d9abf.el6.x86_64

VMs - rhel6.5
ovirt-guest-agent-1.0.9-1.el6.noarch
qemu-guest-agent-0.12.1.2-2.415.el6_5.10.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Start VM and install os
2. yum install ovirt-guest-agent && service start ovirt-guest-agent on VM
3. on host change rpc-port: to something like 8080 in /etc/vdsm/mom.conf
4. restart vdsm on host
5. on host in python
   pprint.pprint(xmlrpclib.ServerProxy("http://localhost:8080").getStatistics())

Actual results:
>>> pprint.pprint(xmlrpclib.ServerProxy("http://localhost:8080").getStatistics())
{'guests': {},
 'host': {'anon_pages': 2205896,
          'cpu_count': 8,
          'ksm_full_scans': 12,
          'ksm_pages_shared': 89552,
          'ksm_pages_sharing': 143483,
          'ksm_pages_to_scan': 64,
          'ksm_pages_unshared': 223167,
          'ksm_pages_volatile': 65653,
          'ksm_run': 1,
          'ksm_shareable': 11135892,
          'ksm_sleep_millisecs': 20,
          'ksmd_cpu_usage': 0,
          'mem_available': 8030384,
          'mem_free': 5464324,
          'mem_unused': 342932,
          'swap_in': 0,
          'swap_out': 0,
          'swap_total': 2097144,
          'swap_usage': 54152}}

Expected results:
memory of VMs should be reported as quests

Additional info:
No errors in vdsm, engine, guest-agent logs