Castellan should be able to bypass SSL certificate check

[Sungjin Yook]

Issue statement
=============

There's a way to pass "verify=False" when creating keystone session and pass that in while instantiating barbicanClient.

i.e.
from keystoneclient import session
...
sess = session.Session(auth=auth, verify=False)
self.barbican = client.Client(session=sess, endpoint="XXX.XXX.XXX.XXX")

So far I am not seeing this option in castellan.
which is really important to have while developing application which can not use proper cert yet.

proposal
=======
create a similar mechanism in castellan as described above.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/398637
Committed: https://git.openstack.org/cgit/openstack/castellan/commit/?id=a6b25bb136e90cb25df336fc4e9d6db4f09c4cb2
Submitter: Jenkins
Branch: master

commit a6b25bb136e90cb25df336fc4e9d6db4f09c4cb2
Author: Kaitlin Farr <email address hidden>
Date: Wed Nov 16 17:51:24 2016 -0500

    Add option for verifying TLS (https) requests

    This new option should be used with caution, but is useful
    for development environments where the certificates can't
    be verified yet.

    Closes-Bug: #1516793

    Change-Id: I2e5433fda8dec02556a6715b8182201daf8fe9bb

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/castellan 0.6.0 release.