Catch all ksa exceptions and map them to SDK exceptions

[Terry Howe]

Users should not have to know about ksa, catch all ksa exceptions and map them to SDK exceptions.

[Everett Toews (everett-toews)]

Map all of https://github.com/openstack/keystoneauth/blob/master/keystoneauth1/exceptions/http.py to HttpException https://github.com/openstack/python-openstacksdk/blob/master/openstack/exceptions.py#L37

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/265071

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/265071
Committed: https://git.openstack.org/cgit/openstack/python-openstacksdk/commit/?id=e0ad907a361a71ce22e89e28bd319b8c8dc18432
Submitter: Jenkins
Branch: master

commit e0ad907a361a71ce22e89e28bd319b8c8dc18432
Author: Everett Toews <email address hidden>
Date: Thu Jan 7 22:52:07 2016 -0600

    Map KSA exception to SDK exceptions

    The use of KSA is an implementation detail. Users should not have to
    know about KSA. Catch all KSA exceptions and map them to SDK
    exceptions.

    Change-Id: Ib873c038358fb318ae46e8bc5bd3b4dfb683daaa
    Closes-Bug: #1526516