Currently network v2 commands don't support client certificate/key
because they were not passed to OpenStackSDK Connection which is used
by network v2 commands.
This changes corrects the integration with OpenStacKSDK to pass client
certificate/key.
Closes-Bug: #1569513
Related-Bug: #1569508
Depends-On: Ic093f8515e7b15931994e4516ebec8f4399d021e
Change-Id: Ie37e8e988ca695a09894c6c93560dacd83f17030