Description of problem:
ovirt-hosted-engine-setup initially call connectStorageServer as soon as the user provides the storage server details.
The call fails:
2015-09-02 13:54:59 DEBUG otopi.plugins.ovirt_hosted_engine_setup.storage.storage storage._storageServerConnection:618 connectStorageServer
2015-09-02 13:54:59 DEBUG otopi.plugins.ovirt_hosted_engine_setup.storage.storage storage._storageServerConnection:681 {'status': {'message': 'OK', 'code': 0}, 'statuslist': [{'status': 100, 'id': '40d3d176-c857-440d-808f-c52474b2d67a'}]}
2015-09-02 13:54:59 DEBUG otopi.context context._executeMethod:156 method exception
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/otopi/context.py", line 146, in _executeMethod
    method['method']()
  File "/usr/share/ovirt-hosted-engine-setup/scripts/../plugins/ovirt-hosted-engine-setup/storage/storage.py", line 1244, in _late_customization
    self._getExistingDomain()
  File "/usr/share/ovirt-hosted-engine-setup/scripts/../plugins/ovirt-hosted-engine-setup/storage/storage.py", line 501, in _getExistingDomain
    self._storageServerConnection()
  File "/usr/share/ovirt-hosted-engine-setup/scripts/../plugins/ovirt-hosted-engine-setup/storage/storage.py", line 688, in _storageServerConnection
    _('Connection to storage server failed')
RuntimeError: Connection to storage server failed

In VDSM log we can find:
Thread-17::DEBUG::2015-09-02 13:54:59,512::task::595::Storage.TaskManager.Task::(_updateState) Task=`8c720316-6320-43ae-a7b0-3aa16c682b6e`::moving from state init -> state preparing
Thread-17::INFO::2015-09-02 13:54:59,513::logUtils::48::dispatcher::(wrapper) Run and protect: connectStorageServer(domType=1, spUUID='00000000-0000-0000-0000-000000000000', conList=[{'protocol_version': 3, 'connection': '192.168.10.2:/nfsshare/storage.1441191248', 'user': 'kvm', 'id': '40d3d176-c857-440d-808f-c52474b2d67a'}], options=None)
Thread-17::DEBUG::2015-09-02 13:54:59,514::fileUtils::143::Storage.fileUtils::(createdir) Creating directory: /rhev/data-center/mnt/192.168.10.2:_nfsshare_storage.1441191248 mode: None
Thread-17::DEBUG::2015-09-02 13:54:59,515::mount::229::Storage.Misc.excCmd::(_runcmd) /usr/bin/sudo -n /usr/bin/mount -t nfs -o soft,nosharecache,timeo=600,retrans=6,nfsvers=3 192.168.10.2:/nfsshare/storage.1441191248 /rhev/data-center/mnt/192.168.10.2:_nfsshare_storage.1441191248 (cwd None)
Thread-17::DEBUG::2015-09-02 13:54:59,543::__init__::298::IOProcessClient::(_run) Starting IOProcess...
Thread-17::ERROR::2015-09-02 13:54:59,559::hsm::2454::Storage.HSM::(connectStorageServer) Could not connect to storageServer
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/hsm.py", line 2451, in connectStorageServer
    conObj.connect()
  File "/usr/share/vdsm/storage/storageServer.py", line 419, in connect
    return self._mountCon.connect()
  File "/usr/share/vdsm/storage/storageServer.py", line 236, in connect
    self.getMountObj().getRecord().fs_file)
  File "/usr/share/vdsm/storage/fileSD.py", line 76, in validateDirAccess
    (os.R_OK | os.X_OK))
  File "/usr/share/vdsm/supervdsm.py", line 50, in __call__
    return callMethod()
  File "/usr/share/vdsm/supervdsm.py", line 48, in <lambda>
    **kwargs)
  File "<string>", line 2, in validateAccess
  File "/usr/lib64/python2.7/multiprocessing/managers.py", line 759, in _callmethod
    kind, result = conn.recv()
AttributeError: 'module' object has no attribute 'Timeout'
Thread-17::DEBUG::2015-09-02 13:54:59,561::hsm::2478::Storage.HSM::(connectStorageServer) knownSDs: {}
Thread-17::INFO::2015-09-02 13:54:59,561::logUtils::51::dispatcher::(wrapper) Run and protect: connectStorageServer, Return response: {'statuslist': [{'status': 100, 'id': '40d3d176-c857-440d-808f-c52474b2d67a'}]}
Thread-17::DEBUG::2015-09-02 13:54:59,561::task::1191::Storage.TaskManager.Task::(prepare) Task=`8c720316-6320-43ae-a7b0-3aa16c682b6e`::finished: {'statuslist': [{'status': 100, 'id': '40d3d176-c857-440d-808f-c52474b2d67a'}]}
Thread-17::DEBUG::2015-09-02 13:54:59,561::task::595::Storage.TaskManager.Task::(_updateState) Task=`8c720316-6320-43ae-a7b0-3aa16c682b6e`::moving from state preparing -> state finished

while in supervdsm logs:
MainProcess|Thread-17::DEBUG::2015-09-02 13:54:59,555::supervdsmServer::109::SuperVdsm.ServerCallback::(wrapper) call validateAccess with ('qemu', ('qemu', 'kvm'), '/rhev/data-center/mnt/192.168.10.2:_nfsshare_storage.1441191248', 5) {}
MainProcess|Thread-17::ERROR::2015-09-02 13:54:59,558::supervdsmServer::113::SuperVdsm.ServerCallback::(wrapper) Error in validateAccess
Traceback (most recent call last):
  File "/usr/share/vdsm/supervdsmServer", line 111, in wrapper
    res = func(*args, **kwargs)
  File "/usr/share/vdsm/supervdsmServer", line 279, in validateAccess
    kwargs=kwargs)
  File "/usr/share/vdsm/supervdsmServer", line 260, in _runAs
    raise Timeout()
Timeout

Version-Release number of selected component (if applicable):
vdsm                 noarch 4.17.4-0.el7        ovirt-3.6-snapshot       893 k

How reproducible:
100%

Steps to Reproduce:
1. call connectStorageServer
2.
3.

Actual results:
AttributeError: 'module' object has no attribute 'Timeout'

Expected results:
it works

Additional info:
It's failing also on the ovirt-hosted-engine-setup CI jobs, all the logs are available here:
http://jenkins-ci.eng.lab.tlv.redhat.com/job/hosted_engine_3.6_el7_staticip_nfs3_install_on_7.1/75/