Add keystoneauth1

[apevec]

new dep for os-client-config

[apevec]

@hguemar @alphacc
Not quite sure if https://github.com/openstack-packages/python-keystoneauth1 packaging is right, after installing it, openstackclient CLI does not backtrace with ImportError but errors out with the message:
The plugin osc_password could not be found

[apevec]

Debugging thread started on rdolist:
https://www.redhat.com/archives/rdo-list/2015-September/msg00162.html

[apevec]

Underlying upstream issue was identified as https://bugs.launchpad.net/python-openstackclient/+bug/1496689
As a temp measure we're pinning os-client-config in #93
Please do not merge keystoneauth1 until further notice!

[apevec]

Relevant openstack-dev thread http://lists.openstack.org/pipermail/openstack-dev/2015-September/074968.html

[apevec]

occ upstream issue is resolved (see pull 93)
so we should proceed with this one!