Description of problem:
RHEV-H upgrade from 3.5.4 to 3.5.5 failed, because vdsm not stopped

Version-Release number of selected component (if applicable):
From:
Red Hat Enterprise Virtualization Hypervisor release 7.1 (20150911.0.el7ev)
ovirt-hosted-engine-ha-1.2.6-3.el7ev.noarch
ovirt-node-plugin-hosted-engine-0.2.0-18.0.el7ev.noarch
ovirt-hosted-engine-setup-1.2.5.3-1.el7ev.noarch
vdsm-4.16.26-1.el7ev.x86_64
To:
rhev-hypervisor7-7.1-20151013.0.el7ev

How reproducible:
Always

Steps to Reproduce:
1. Install rhev-hypervisor7-7.1-20150911.0.el7ev(https://brewweb.devel.redhat.com/buildinfo?buildID=456370) on two hosts
2. Deploy hosted-engine on both environments(not sure if it connect)
3. Put host without engine vm to maintenance, and try to upgrade host to rhev-hypervisor7-7.1-20151013.0.el7ev(https://brewweb.devel.redhat.com/buildinfo?buildID=460832)

Actual results:
Upgrade fail with error message under ovirt-node-upgrade.log
2015-10-14 07:42:39,705 - DEBUG    - ovirt-node-upgrade - Failed to stop vdsdm: Error:  ServiceOperationError: _systemctlStop failed
Job for vdsmd.service canceled.



2015-10-14 07:42:39,705 - ERROR    - ovirt-node-upgrade - Error: Upgrade Failed: Command Failed: '('/usr/libexec/ovirt-node/hooks/pre-upgrade/01-vdsm',)' [u'/usr/libexec/ovirt-node/hooks/pre-upgrade/01-vdsm: Stopping vdsmd to upgrade']
Traceback (most recent call last):
  File "/usr/sbin/ovirt-node-upgrade", line 365, in run
    self._run_hooks("pre-upgrade")
  File "/usr/sbin/ovirt-node-upgrade", line 197, in _run_hooks
    self._system(hook)
  File "/usr/sbin/ovirt-node-upgrade", line 145, in _system
    raise RuntimeError("Command Failed: '%s' %s" % (command, output))
RuntimeError: Command Failed: '('/usr/libexec/ovirt-node/hooks/pre-upgrade/01-vdsm',)' [u'/usr/libexec/ovirt-node/hooks/pre-upgrade/01-vdsm: Stopping vdsmd to upgrade']


Expected results:
Upgrade succeed

Additional info:
The same problem exist in RHEV-H 6.7