Explicitly disable vCenter certificate verification check

[OpenStack Infra]

https://review.openstack.org/245088
commit d7680c70fee1e7d156c2a403bfb8d8105d521a17
Author: Igor Zinovik <email address hidden>
Date: Fri Nov 13 13:49:05 2015 +0300

    Explicitly disable vCenter certificate verification check

    - nova-compute with enabled VCDriver by default tries to verify vCenter
      certificate, if it cannot verify certificate then it cannot start and
      operate normally. This breaks deployment process for OpenStack
      clusters that use vCenter, because later in post deployment stage we
      cannot add nova-compute services to availability zone, because they
      failed to start.

    Change-Id: Iac725db304aae9cd9da910f16d16d4054cc10542
    Closes-bug: #1513832
    DocImpact: Document the fact that currently it is not possible to
    verify vCenter SSL certificate by providing CA certificate bundle.

[Olga Gusarenko (ogusarenko)]

There is a duplicate https://bugs.launchpad.net/fuel/+bug/1525306